Around 1145 Owain "Great" King Gwynedd (age 45) and Cristin ferch Goronwy Unknown Queen Consort Gwynedd (age 40) were married. She by marriage Queen Consort Gwynedd. He the son of King Gruffudd ap Cynan of Gwynedd and Angharad Queen Consort Gwynedd (age 80). They were first cousins.

Around 1155 Rhys ap Gruffydd "The Lord Rhys" Dinefwr (age 23) and Gwenllian ferch Madog Mathrafal were married. She the daughter of Madog ap Maredudd Mathrafal Prince Powys and Susanna Aberffraw (age 18). He the son of Gruffudd ap Rhys King Deheubarth and Gwenllian Aberffraw Queen Consort Deheubarth. They were first cousins.

In 1191 Alfonso IX King Leon (age 19) and Theresa of Portugal Queen Consort Leon (age 15) were married. She by marriage Queen Consort Leon. She the daughter of Sancho "Populator" I King Portugal (age 36) and Dulce Barcelona Queen Consort Portugal. He the son of Ferdinand II King Leon and Urraca Burgundy Queen Consort Leon (age 43). They were first cousins.

On 02 Oct 1380 Gian Galeazzo Visconti 1st Duke Milan (age 28) and Caterina Visconti Duke Milan (age 19) were married in the Church of San Giovanni in Conca. They were first cousins.

In 1386 John Valois (age 23) and Catherine Valois were married. She the daughter of King Charles V of France and Joanna Bourbon Queen Consort France. He the son of John Valois 1st Duke Berry (age 45) and Joanne Armagnac Duchess Berry (age 39). They were first cousins. She a great x 4 granddaughter of King Henry III of England.

In 1389 Louis Valois Duke Touraine I Duke Orléans (age 16) and Valentina Visconti (age 18) were married. He the son of King Charles V of France and Joanna Bourbon Queen Consort France. They were first cousins. He a great x 4 grandson of King Henry III of England.

Before 1406 Geoffrey Boleyn (age 26) and Alice Bracton (age 20) were married. They were first cousins.

In 1406 Charles Valois Duke Orléans (age 11) and Isabella Valois Queen Consort England (age 16) were married at Compiègne, Oise. She by marriage Duchess Orléans. She the daughter of Charles "Beloved Mad" VI King France (age 37) and Isabeau Wittelsbach Queen Consort France (age 36). He the son of Louis Valois Duke Touraine I Duke Orléans (age 33) and Valentina Visconti (age 35). They were first cousins. He a great x 5 grandson of King Henry III of England. She a great x 5 granddaughter of King Henry III of England.

On 12 Jun 1415 Alfonso V King Aragon (age 19) and Maria Trastámara Queen Consort Aragon (age 13) were married. She by marriage Queen Consort Aragon. She the daughter of Henry III King Castile and Catherine of Lancaster Queen Consort Castile (age 42). He the son of Ferdinand I King Aragon (age 34) and Eleanor of Alberquerque Queen Consort Aragon (age 41). They were first cousins. She a great granddaughter of King Edward III of England.

Before 23 Sep 1415 Edward Burnell (age 44) and Elizabeth Pole (age 25) were married. She the daughter of Michael de la Pole 2nd Earl Suffolk (deceased) and Katherine Stafford Countess Suffolk (age 39). They were first cousins. She a great x 4 granddaughter of King Edward "Longshanks" I of England.

In 1418 John II King Castile (age 12) and Maria Trastámara Queen Consort Castile (age 22) were married. She by marriage Queen Consort Castile. She the daughter of Ferdinand I King Aragon and Eleanor of Alberquerque Queen Consort Aragon (age 44). He the son of Henry III King Castile and Catherine of Lancaster Queen Consort Castile (age 44). They were first cousins. He a great grandson of King Edward III of England.

In 1418 John Valois IV Duke Brabant (age 14) and Jacqueline Wittelsbach Duchess Brabant and Gloucester (age 16) were married. She the daughter of William Wittelsbach IV Count Holland VI Count Hainault V Count Zeeland and Margaret Valois Countess Holland (age 43). He the son of Anthony Valois Duke Brabant and Jeanne Luxemburg Duchess Brabant. They were first cousins. He a great x 3 grandson of King Edward "Longshanks" I of England. She a great x 4 granddaughter of King Edward "Longshanks" I of England.

In 1440 Henry IV King Castile (age 14) and Blanche Trastámara II Queen Navarre (age 16) were married. She the daughter of John II King Aragon (age 41) and Blanche Évreux Queen Consort Aragon (age 52). He the son of John II King Castile (age 34) and Maria Trastámara Queen Consort Castile (age 44). They were first cousins. He a great x 2 grandson of King Edward III of England.

In 1447 Alfonso "The African" V King Portugal (age 14) and Isabella Aviz Queen Consort Portugal (age 15) were married. She by marriage Queen Consort Portugal. He the son of Edward "The Philosopher" I King Portugal and Eleanor Trastámara Queen Consort Portugal. They were first cousins. He a great x 2 grandson of King Edward III of England. She a great x 2 granddaughter of King Edward III of England.

In 1447 Ferdinand Aviz 2nd Duke Viseu (age 13) and Beatrice Aviz Duchess Viseu (age 16) were married. He the son of Edward "The Philosopher" I King Portugal and Eleanor Trastámara Queen Consort Portugal. They were first cousins. He a great x 2 grandson of King Edward III of England. She a great x 2 granddaughter of King Edward III of England.

On 30 Oct 1454 Charles "Bold" Valois Duke Burgundy (age 20) and Isabella Bourbon (age 18) were married. She the daughter of Charles Bourbon I Duke Bourbon (age 53) and Agnes Valois Duchess Bourbon (age 50). He the son of Philip "Good" Valois III Duke Burgundy (age 58) and Isabella Aviz Duchess Burgundy (age 57). They were first cousins. He a great x 2 grandson of King Edward III of England. She a great x 5 granddaughter of King Edward "Longshanks" I of England.

In 1455 Henry IV King Castile (age 29) and Joan Aviz Queen Consort Castile (age 15) were married. She by marriage Queen Consort Castile. She the daughter of Edward "The Philosopher" I King Portugal and Eleanor Trastámara Queen Consort Portugal. He the son of John II King Castile and Maria Trastámara Queen Consort Castile. They were first cousins. He a great x 2 grandson of King Edward III of England. She a great x 2 granddaughter of King Edward III of England.

Before 1460 John Bagot (age 24) and Isabella Curzon (age 23) were married. They were first cousins.

On 06 Aug 1462 William Beaumont 2nd Viscount Beaumont (age 24) and Joan Stafford Viscountess Beaumont (age 20) were married. She by marriage Viscountess Beaumont. She the daughter of Humphrey Stafford 1st Duke of Buckingham and Anne Neville Duchess Buckingham (age 54). He the son of John Beaumont 1st Viscount Beaumont and Katherine Neville Duchess Norfolk (age 62). They were first cousins. He a great x 2 grandson of King Edward III of England. She a great x 2 granddaughter of King Edward III of England.

Before 1470 John Harrington and Maud Clifford (age 27) were married. They were first cousins. She a great x 4 granddaughter of King Edward III of England.

On 14 Sep 1476 Ferdinand I King Naples (age 53) and Joanna of Aragon Queen Consort Naples (age 22) were married. She by marriage Queen Consort Naples. The difference in their ages was 30 years. She the daughter of John II King Aragon (age 78) and Juana Enríquez Queen Consort Aragon. He the illegitmate son of Alfonso V King Aragon and Giralda Carlino. They were first cousins.

Before 1477 William Beaumont 2nd Viscount Beaumont (age 38) and Joan Stafford Viscountess Beaumont (age 34) were divorced (or the marriage was set aside).

After 1487 William Darcy (age 27) and Margaret St Lawrence were married. They were first cousins.

In Feb 1489 Gian Galeazzo Sforza 6th Duke Milan (age 19) and Isabella Trastámara Duchess Milan (age 18) were married. She by marriage Duchess Milan. She the daughter of Alfonso II King Naples (age 40) and Ippolita Maria Sforza. They were first cousins.

In or before 1491 Thomas Kennedy 3rd of Bargany (age 30) and Katherine Kennedy (age 20) were married. They were first cousins.

On 08 Jul 1505 John Stewart 2nd Duke Albany (age 21) and Anne de la Tour Auvergne Duchess Albany (age 9) were married. She the daughter of Jean III Count Auvergne. He the son of Alexander Stewart 1st Duke Albany and Anne de la Tour Auvergne Duchess Albany. They were first cousins. He a great x 4 grandson of King Edward III of England.

On 10 Feb 1525 John III King Portugal (age 22) and Catherine of Austria Queen Consort Portugal (age 18) were married. She by marriage Queen Consort Portugal. She the daughter of Philip "Handsome Fair" King Castile and Joanna "The Mad" Trastámara Queen Castile (age 46). He the son of Manuel "Fortunate" I King Portugal and Maria Trastámara Queen Consort Portugal. They were first cousins. He a great x 4 grandson of King Edward III of England. She a great x 4 granddaughter of King Edward III of England.

On 10 Mar 1526 Charles V Holy Roman Emperor (age 26) and Isabel Aviz Queen Consort Spain (age 22) were married. She the daughter of Manuel "Fortunate" I King Portugal and Maria Trastámara Queen Consort Portugal. He the son of Philip "Handsome Fair" King Castile and Joanna "The Mad" Trastámara Queen Castile (age 47). They were first cousins. He a great x 4 grandson of King Edward III of England. She a great x 4 granddaughter of King Edward III of England.

In 1542 Teodosio I Duke of Braganza (age 32) and Isabel de Lencastre (age 28) were married. They were first cousins. He a great x 5 grandson of King Edward III of England. She a great x 5 granddaughter of King Edward III of England.

On 13 Sep 1548 Maximilian Habsburg Spain II Holy Roman Emperor (age 21) and Maria of Spain Holy Roman Empress (age 20) were married. She the daughter of Charles V Holy Roman Emperor (age 48) and Isabel Aviz Queen Consort Spain. He the son of Ferdinand I Holy Roman Emperor (age 45) and Anne Jagiellon Holy Roman Empress. They were first cousins. He a great x 5 grandson of King Edward III of England. She a great x 5 granddaughter of King Edward III of England.

On 14 Jun 1557 Jean Bourbon Count Soissons and Enghien (age 28) and Marie Bourbon (age 18) were married. She the daughter of Francis Bourbon Duke Estouteville and Adrienne Estouteville Duchess Estouteville (age 44). He the son of Charles Bourbon Duke Vendôme and Françoise Valois Countess Vendôme. They were first cousins.

Before 1562 Richard Butler 1st Viscount Mountgarret (age 62) and Eleanor Butler Viscountess Mountgarret were married. She by marriage Viscountess Mountgarret. He the son of Piers "Red" Butler 8th Earl Ormonde 1st Earl Ossory and Margaret Fitzgerald Countess Ormonde and Ossory. They were first cousins.

On 29 Apr 1584 Vincenzo Gonzaga III Duke Mantua (age 21) and Eleanor de Medici Duchess Mantua (age 17) were married. They were first cousins.

On 06 Feb 1595 Maximilian "The Great" Wittelsbach I Duke Bavaria I Elector Bavaria (age 21) and Elisabeth Renata Lorraine Duchess Bavaria (age 20) were married. She by marriage Duchess Bavaria. She the daughter of Charles "The Great" Lorraine III Duke Lorraine (age 51) and Claude Valois Duchess Lorraine. He the son of William Wittelsbach V Duke Bavaria (age 46) and Renata Lorraine Duchess Bavaria (age 50). They were first cousins.

On 04 Dec 1611 Matthias I Holy Roman Emperor (age 54) and Anna of Austria Holy Roman Empress (age 26) were married. She by marriage Holy Roman Empress. The difference in their ages was 28 years. He the son of Maximilian Habsburg Spain II Holy Roman Emperor and Maria of Spain Holy Roman Empress. They were first cousins.

On 04 Sep 1622 Duke Adolphus Frederick I of Mecklenburg-Schwerin (age 33) and Anna Maria of Ostfriesland (age 21) were married. They were first cousins.

In 1625 Charles Lorraine II Duke Lorraine (age 20) and Nicole Lorraine Duchess Lorraine (age 16) were married. She the daughter of Henry Lorraine II Duke Lorraine and Margherita Gonzaga Duchess Lorraine (age 33). He the son of Francis Lorraine II Duke Lorraine (age 52). They were first cousins.

On 20 Feb 1631 Ferdinand King Bohemia III Holy Roman Emperor (age 22) and Maria Anna of Spain Holy Roman Empress (age 24) were married. She by marriage Queen Consort Bohemia. She the daughter of Philip III King Spain and Margaret of Austria Queen Consort Spain. He the son of Ferdinand of Spain II Holy Roman Emperor (age 52) and Maria Anna Wittelsbach Holy Roman Empress. They were first cousins.

On 27 Jun 1631 William Maxwell 6th Earl Nithsdale and Catherine Stewart were married. She the daughter of Charles Stewart 4th Earl Traquair and Mary Maxwell Countess Traquair. He the son of William Maxwell 5th Earl Nithsale and Winifred Herbert Countess Nithsdale. They were first cousins.

Before 1634 Simon Luttrell (age 34) and Mary Preston (age 19) were married. They were first cousins.

After 1638 Robert Rich 3rd Earl Warwick (age 26) and Anne Cheeke Countess Warwick (age 18) were married. She by marriage Countess Warwick. He the son of Robert Rich 2nd Earl Warwick (age 50) and Frances Hatton Countess Warwick. They were first cousins.

In May 1640 George Carteret 1st Baronet (age 30) and Lady Elizabeth Carteret (age 38) were married. They were first cousins.

In 1641 Henry O'Brien 7th Earl Thomond (age 21) and Anne O'Brien Countess Thomond were married. She the daughter of Henry O'Brien 5th Earl Thomond and Mary Brereton Countess Thomond. He the son of Barnabas O'Brien 6th Earl Thomond and Anne or Mary Fermor (age 49). They were first cousins.

On 24 Dec 1646 Christoper Wray 4th Baronet (age 25) and Frances Foljambe Lady Glentworth (age 19) were married. She by marriage Lady Wray of Glentworth in Lincolnshire. They were first cousins.

In or before 1647 Alexander Elphinstone 6th Lord Elphinstone (age 44) and Lilias Elphinstone (age 33) were married. They were first cousins.

In 1647 John Hobart 3rd Baronet (age 18) and Philippa Hobart (age 11) were married. They were first cousins. She a great x 5 granddaughter of King Henry VII of England and Ireland.

On 02 Jul 1648 Ferdinand King Bohemia III Holy Roman Emperor (age 39) and Maria Leopoldine Habsburg Spain Queen Consort Bohemia (age 16) were married at Linz. She by marriage Queen Consort Bohemia. The difference in their ages was 23 years. He the son of Ferdinand of Spain II Holy Roman Emperor and Maria Anna Wittelsbach Holy Roman Empress. They were first cousins.

Before 25 Dec 1650 Philippe Carteret 1st Baronet (age 30) and Anne Dumaresq Baroness Carteret (age 23) were married. They were first cousins.

On 15 Jun 1651 Ernest Günther Oldenburg I Duke Schleswig Holstein Sonderburg Augustenburg (age 41) and Auguste Oldenburg Duchess Schleswig Holstein Sonderburg Augustenburg (age 17) were married. She by marriage Duchess Schleswig Holstein Sonderburg Augustenburg. The difference in their ages was 23 years. He the son of Alexander Oldenburg I Duke Schleswig Holstein Sonderburg and Dorothea Schwarzburg Duchess Schleswig Holstein Sonderburg. They were first cousins.

In 1652 Anthony Cope 4th Baronet (age 19) and Mary Gerard Lady Cope were married. She by marriage Lady Cope of Hanwell in Oxfordshire. They had four children all of whom appear to have died young. They were first cousins.

Before 30 May 1653 Ferdinand Charles Habsburg Spain (age 25) and Anna de Medici (age 36) were married. They were first cousins.

On 30 Jun 1653 Robert Arbuthnot 1st Viscount Arbuthnott (age 28) and Catherine Fraser Viscountess Arbuthnot were married. She by marriage Viscountess Arbuthnot. They were first cousins.

After 1659 Charles Northcote and Sarah Northcote were married. They were first cousins.

On 31 Mar 1661 Philip Bourbon I Duke Orléans (age 20) and Princess Henrietta Stewart Duchess Orléans (age 16) were married. She by marriage Duchess Orléans. She the daughter of King Charles I of England, Scotland and Ireland and Henrietta Maria Bourbon Queen Consort England (age 51). He the son of Louis XIII King France and Anne of Austria Spain Queen Consort France (age 59). They were first cousins.

On 03 Apr 1663 Charles Emmanuel II Duke of Savoy (age 28) and Françoise Madeleine d'Orléans (age 14) were married. He the son of Victor Amadeus I Duke of Savoy and Christine Marie Bourbon Duchess Savoy (age 57). They were first cousins.

Before 21 May 1667 Theophilus Clinton 4th Earl Lincoln (age 67) and Elizabeth Gorges Countess Lincoln were married. She by marriage Countess Lincoln. He the son of Thomas Clinton 3rd Earl Lincoln and Elizabeth Knyvet Countess Lincoln. They were first cousins.

Before 06 Jun 1668 Robert Sheffield of Kensington and Mary Fanshawe (age 32) were married. They were first cousins.

In or before 1673 Thomas Vane and Frances Liddell (age 13) were married. They were first cousins.

Before 29 Mar 1674 Charles I Landgrave Hesse-Kassel (age 19) and Maria Amalia of Courland Landgravine Hesse-Kassel (age 20) were married. She by marriage Landgravine Hesse Kassel. He the son of Wilhelm "The Just" VI Hesse-Kassel and Hedwig Sophia Hohenzollern (age 50). They were first cousins.

In Apr 1674 William Fiennes 3rd Viscount Saye and Sele (age 33) and Mary Fiennes (age 21) were married. They were first cousins.

On 08 Oct 1674 Charles Hamilton 5th Earl Haddington (age 24) and Margaret Leslie 8th Countess Rothes and Haddington were married. She by marriage Countess Haddington. She the daughter of John Leslie 1st Duke Rothes (age 44) and Anne Lindsay Duchess Rothes. He the son of John Hamilton 4th Earl Haddington and Christian Lindsay Countess Haddington. They were first cousins.

In 1679 King George I of Great Britain and Ireland (age 18) and Sophia Dorothea Hanover Queen Consort England (age 12) were married. She the daughter of George Wilhelm Hanover Duke Brunswick-Lüneburg (age 54) and Eleonore Esmier D'Olbreuse Duchess Brunswick-Lüneburg. He the son of Ernest Augustus Hanover Elector Brunswick-Lüneburg (age 49) and Sophia Palatinate Simmern (age 48). They were first cousins. He a great grandson of King James I of England and Ireland and VI of Scotland.

Before 1680 Frederick I King Prussia (age 22) and Elisabeth Henriëtte Hesse-Kassel (age 18) were married. She the daughter of Wilhelm "The Just" VI Hesse-Kassel and Hedwig Sophia Hohenzollern (age 56). He the son of Frederick William "Great Elector" Hohenzollern Elector Brandenburg (age 59) and Luise Henriette Orange Nassau. They were first cousins.

On 01 Jan 1685 Frederick Louis Oldenburg I Duke Schleswig-Holstein-Sonderburg-Beck (age 31) and Louise Charlotte Oldenburg Duchess Schleswig-Holstein-Sonderburg-Beck (age 26) were married. She by marriage Duchess Schleswig-Holstein-Sonderburg-Beck. She the daughter of Ernest Günther Oldenburg I Duke Schleswig Holstein Sonderburg Augustenburg (age 75) and Auguste Oldenburg Duchess Schleswig Holstein Sonderburg Augustenburg (age 51). He the son of August Philipp Oldenburg I Duke Schleswig-Holstein-Sonderburg-Beck and Marie Sibylle Nassau Saarbrücken Duchess Schleswig-Holstein-Sonderburg-Beck. They were first cousins.

In Jun 1685 William Kerr 2nd Marquess Lothian (age 24) and Jean Campbell Marchioness Lothian were married. She the daughter of Archibald Campbell 9th Earl Argyll (age 56) and Mary Stewart Countess Argyll. He the son of Robert Kerr 1st Marquess Lothian (age 49) and Jean Campbell. They were first cousins.

After 30 Aug 1688 William Tracy 4th Viscount Tracy (age 31) and Jane Leigh Viscountess Tracy (age 23) were married. They were first cousins.

On 01 Mar 1690 John Holles 1st Duke Newcastle upon Tyne (age 28) and Margaret Cavendish Duchess Newcastle upon Tyne (age 28) were married. She by marriage Countess Clare. She the daughter of Henry Cavendish 2nd Duke Newcastle upon Tyne (age 59) and Frances Pierrepont Duchess Newcastle upon Tyne (age 59). He the son of Gilbert Holles 3rd Earl de Clare and Grace Pierrepont Countess de Clare (age 57). They were first cousins.

In Nov 1691 Edward Russell 1st Earl Orford (age 38) and Margaret Russell Countess Orford (age 35) were married. She by marriage Countess Orford. She the daughter of William Russell 1st Duke Bedford (age 75) and Anne Carr Countess of Bedford. They were first cousins.

On 18 Feb 1692 Philippe Bourbon II Duke Orléans (age 17) and Françoise Marie Bourbon Duchess Orléans (age 15) were married at Palace of Versailles, Versailles. She by marriage Duchess Orléans. She the illegitmate daughter of Louis "Sun King" XIV King France (age 53) and Françoise Athénaïs Marquise Montespan (age 51). He the son of Philip Bourbon I Duke Orléans (age 51) and Elizabeth Charlotte Palatinate Simmern Duchess Orléans (age 39). They were first cousins. He a great x 2 grandson of King James I of England and Ireland and VI of Scotland.

Before 1693 Francis Lee and Elizabeth Lee were married. She the daughter of Edward Lee 1st Earl Lichfield (age 29) and Charlotte Fitzroy Countess Lichfield (age 28). They were first cousins. She a granddaughter of King Charles II of England Scotland and Ireland.

In or before 1695 Thomas Foley (age 25) and Anne Knightley (age 24) were married. They were first cousins.

In 1696 Thomas Hamilton 6th Earl Haddington (age 15) and Helen Hope Countess Haddington (age 18) were married. She by marriage Countess Haddington. He the son of Charles Hamilton 5th Earl Haddington and Margaret Leslie 8th Countess Rothes and Haddington. They were first cousins.

On 12 Jan 1697 Henry Nassau 1st Earl Grantham (age 24) and Henrietta Butler Countess Grantham were married. She the daughter of Thomas Butler 6th Earl Ossory and Emilia Nassau Beverweert Countess Ossory. They were first cousins.

Around 01 Aug 1697 Robert Constable 3rd Viscount Dunbar (age 46) and Dorothy Brudenell Viscountess Dunbar (age 54) were married. She by marriage Viscountess Dunbar. She the daughter of Robert Brudenell 2nd Earl Cardigan (age 90) and Anna Savage Countess Cardigan. They were first cousins.

In 1700 Frederick I King Sweden (age 23) and Louise Dorothea Hohenzollern (age 19) were married. She the daughter of Frederick I King Prussia (age 42) and Elisabeth Henriëtte Hesse-Kassel. He the son of Charles I Landgrave Hesse-Kassel (age 45) and Maria Amalia of Courland Landgravine Hesse-Kassel (age 46). They were first cousins.

Around 1700 Edward Phelips (age 22) and Anne Phelips (age 12) were married. He would, twenty years later, marry her sister Elizabeth Phelips; an example of Married to Two Siblings. They were first cousins.

On 06 Jan 1702 Arthur Annesley 5th Earl Anglesey (age 22) and Mary Thompson Countess Anglesey were married. He the son of James Annesley 2nd Earl Anglesey and Elizabeth Manners Countess Anglesey. They were first cousins.

In Jul 1704 Allen Bathurst 1st Earl Bathurst (age 19) and Catherine Apsley Countess Bathurst Sussex were married. They were first cousins.

In or before 1706 Thomas Trevor 1st Baron Trevor Bromham (age 47) and Anne Welden (age 35) were married. They were first cousins.

On 28 Nov 1706 Frederick William "Soldier King" I King Prussia (age 18) and Sophia Dorothea Hanover Queen Consort Prussia (age 19) were married. She the daughter of King George I of Great Britain and Ireland (age 46) and Sophia Dorothea Hanover Queen Consort England (age 40). He the son of Frederick I King Prussia (age 49) and Sophia Charlotte Hanover Queen Consort Prussia. They were first cousins. He a great x 2 grandson of King James I of England and Ireland and VI of Scotland.

Before 1708 Baptist Noel 3rd Earl Gainsborough (age 24) and Dorothy Manners Countess Gainsborough (age 17) were married. She by marriage Countess Gainsborough. She the daughter of John Manners 1st Duke Rutland (age 69) and Catherine Noel Duchess Rutland (age 50). They were first cousins.

In or before 1710 Thomas Gage and Delariviere D'Ewes were married. They were first cousins.

In 1710 George Downing 3rd Baronet (age 24) and Mary Forester Lady Downing (age 25) were married. They were first cousins.

Before 05 Oct 1711 Andrew St John 4th Baronet (age 26) and Anne James were married. They were first cousins.

In 1712 Maurice Thompson 2nd Baron Haversham (age 37) and Elizabeth Annesley were married. They were first cousins.

In 1712 John Brownlow 1st Viscount Tyconnel (age 21) and Eleanor Brownlow Viscountess Tyconnel (age 21) were married. She by marriage Lady Brownlow of Humby in Lincolnshire. They were first cousins.

On 09 Jul 1713 Louis Henri Bourbon Condé Duke Bourbon (age 20) and Marie Anne Bourbon Condé Conti (age 24) were married. They were first cousins. He a great x 3 grandson of King James I of England and Ireland and VI of Scotland. She a great x 3 granddaughter of King James I of England and Ireland and VI of Scotland.

Before 07 Jan 1714 Bourchier Wrey 5th Baronet (age 32) and Diana Rolle (age 31) were married. They were first cousins.

In or before 1715 Willem Maurits van Nassau (age 36) and Charlotte van Nassau Odijk (age 37) were married. They were first cousins.

On 17 Jul 1716 Harry Trelawny 5th Baronet (age 29) and Letitia Trelawny were married. She the elder sister of John Trelawny 4th Baronet (age 24). They had been courting for many years before her father Bishop Jonathan Trelawny 3rd Baronet (age 66) consented to their marriage. They had a son, who predeceased him, and three daughters, one of whom, Laetitia, also married a cousin. She the daughter of Bishop Jonathan Trelawny 3rd Baronet (age 66) and Rebecca Hele Lady Trelawny. They were first cousins.

In or before 1718 William Stafford-Howard 2nd Earl Stafford (age 28) and Anne Holman Countess Stafford were married. They were first cousins.

Around 1720 Edward Phelips (age 42) and Elizabeth Phelips were married. She the sister of his first wife Anne Phelips; an example of Married to Two Siblings. Both of whom were his first cousin. They were first cousins.

On 29 Mar 1720 William O'Brien 4th Earl Inchiquin (age 20) and Anne Hamilton 2nd Countess Orkney and Inchiquin were married. She by marriage Countess Inchiquin. She the daughter of George Hamilton 1st Earl Orkney (age 54) and Elizabeth Villiers Countess Orkney (age 63). He the son of William O'Brien 3rd Earl Inchiquin and Mary Villiers Countess Inchiquin. They were first cousins.

Before 14 Mar 1722 James Butler (age 51) and Eleanor Loftus were married. His second marrige. There was no issue. They were first cousins.

On 30 Jul 1728 Francis Seymour (age 31) and Elizabeth Popham Viscountess Hinchingbrooke (age 35) were married. They were first cousins.

On 29 Sep 1729 Walter Calverley aka Blackett (age 21) and Elizabeth Orde Lady Blackett were married. They were first cousins.

Before 06 Aug 1730 Bishop Thomas Vesey 1st Baronet (age 62) and Mary Muschamp (age 55) were married. They were first cousins.

On 17 Aug 1732 John Evelyn 2nd Baronet (age 25) and Mary Boscawen (age 26) were married. They were first cousins.

On 01 Jul 1738 Coventry Carew 6th Baronet (age 21) and Mary Bampfylde Lady Carew were married at Church of St George the Martyr, Queen Square. They were first cousins.

On 17 Oct 1744 Henry Fiennes Pelham-Clinton 2nd Duke Newcastle-under-Lyme (age 24) and Catherine Pelham Duchess Newcastle under Lyne (age 17) were married. She by marriage Countess Lincoln. He the son of Henry Clinton 7th Earl Lincoln and Lucy Pelham Countess Lincoln. They were first cousins.

In 1748 Theophilus Biddulph 4th Baronet (age 28) and Jane Biddulph Lady Biddulph (age 20) were married. She by marriage Lady Biddulph of Westcombe in Kent. They were first cousins.

On 08 Sep 1748 Vice admiral John "Foulweather Jack" Byron (age 24) and Sophia Trevannion (age 19) were married. They were first cousins.

On 21 Nov 1748 Bishop John Egerton (age 26) and Anne Sophia Grey were married. She the daughter of Henry Grey 1st Duke Kent and Sophia Bentinck Duchess Kent. He the son of Bishop Henry Egerton and Elizabeth Adriana Bentinck (age 45). They were first cousins.

In 1749 Thomas Parker 3rd Earl Macclesfield (age 25) and Mary Heathcote Countess Macclesfield were married. He the son of George Parker 2nd Earl Macclesfield (age 53). They were first cousins.

In 1749 James Stuart Mackenzie (age 26) and Elizabeth Campbell were married. She the daughter of John Campbell 2nd Duke Argyll. He the son of James Stuart 2nd Earl Bute and Anne Campbell Countess Bute. They were first cousins.

In 1753 Murrough O'Brien 1st Marquess Thomond (age 27) and Mary O'Brien 3rd Countess Orkney and Inchquin (age 32) were married. She the daughter of William O'Brien 4th Earl Inchiquin (age 53) and Anne Hamilton 2nd Countess Orkney and Inchiquin. They were first cousins.

On 23 Oct 1753 John Murray 3rd Duke Atholl (age 24) and Charlotte Murray Duchess Atholl (age 22) were married. She the daughter of James Murray 2nd Duke Atholl (age 63) and Jane Frederick Duchess Atholl. They were first cousins.

On 25 Jun 1754 William Trelawny 6th Baronet (age 32) and Laetitia Trelawny (age 26) were married at Maker, Cornwall. They had a son and a daughter. They were first cousins.

In or before 1755 John Delaval 1st Baron Delaval (age 26) and Susanna Robinson Baroness Delaval (age 24) were married. They were first cousins.

Before 1758 Richard Hoare 1st Baronet (age 22) and Anne Hoare (age 20) were married. They were first cousins.

Before 1760 William Edwardes 1st Baron Kensington (age 49) and Rachel Edwardes (age 36) were married. They were first cousins.

On 22 Jul 1762 John Molesworth 5th Baronet (age 33) and Barbara St Aubyn (age 32) were married. They were first cousins.

On 01 Sep 1764 William Elector of Hesse (age 21) and Electress Wilhelmina Caroline Oldenburg (age 17) were married at Christiansborg Castle. She the daughter of Frederick V King Denmark and Norway (age 41) and Louise Hanover Queen Consort Denmark and Norway. He the son of Frederick Hesse-Kassel (age 44) and Mary Hanover (age 41). They were first cousins. He a grandson of King George II of Great Britain and Ireland. She a granddaughter of King George II of Great Britain and Ireland.

In 1765 Charles IV King Spain (age 16) and Maria Luisa of Parma (age 13) were married. He the son of Charles III King Spain (age 48). They were first cousins. She a great x 4 granddaughter of King Charles I of England, Scotland and Ireland.

On 26 Sep 1765 George Harcourt 2nd Earl Harcourt (age 29) and Elizabeth Venables-Vernon Countess Harcourt (age 19) were married. He the son of Simon Harcourt 1st Earl Harcourt (age 51) and Rebecca Samborne Le Bass. They were first cousins.

On 05 Oct 1765 Charles Bagot aka Chester (age 35) and Catherine Legge (age 24) were married. They were first cousins.

Before 11 Jul 1766 Philip Egerton of Oulton (age 28) and Mary Eyles-Styles (age 21) were married. They were first cousins.

On 30 Aug 1766 Charles Hesse-Kassel (age 21) and Louise Oldenburg (age 16) were married at Christiansborg Castle. She the daughter of Frederick V King Denmark and Norway and Louise Hanover Queen Consort Denmark and Norway. He the son of Frederick Hesse-Kassel (age 46) and Mary Hanover (age 43). They were first cousins. He a grandson of King George II of Great Britain and Ireland. She a granddaughter of King George II of Great Britain and Ireland.

On 08 Nov 1766 Christian VII King Denmark and Norway (age 17) and Caroline Matilda Hanover Queen Consort Denmark and Norway (age 15) were married at Christiansborg Castle. She by marriage Queen Consort Denmark and Norway. She the daughter of Frederick Louis Hanover Prince of Wales and Augusta Saxe Coburg Altenburg (age 46). He the son of Frederick V King Denmark and Norway and Louise Hanover Queen Consort Denmark and Norway. They were first cousins. He a grandson of King George II of Great Britain and Ireland. She a granddaughter of King George II of Great Britain and Ireland.

On 16 Dec 1769 General George Hotham (age 28) and Diana Pennyman were married. They were first cousins.

After 12 Dec 1773 William Fitzroy and Elizabeth Fitzroy were married. She the daughter of Augustus Henry Fitzroy 3rd Duke Grafton (age 38) and Elizabeth Wrottesley Duchess Grafton (age 28). They were first cousins. He a great x 3 grandson of King Charles II of England Scotland and Ireland. She a great x 3 granddaughter of King Charles II of England Scotland and Ireland.

On 27 Jan 1776 Nigel Bowyer Gresley 7th Baronet (age 23) and Wilmot Gresley were married by which he acquired Drakelow Hall. They were first cousins.

Before 22 Jun 1776 William Byron (age 26) and Juliana Elizabeth Byron were married having eloped to Gretna Green, Dumfrieshire. They were first cousins.

On 14 Aug 1777 Henry Howard 12th Earl Suffolk 5th Earl Berkshire (age 38) and Charlotte Finch Countess Suffolk and Berkshire (age 23) were married. She by marriage Countess Suffolk, Countess Berkshire. She the daughter of Heneage Finch 3rd Earl Aylesford and Charlotte Seymour Countess Aylesford (age 46). They were first cousins.

In 1778 Other Windsor 5th Earl Plymouth (age 26) and Sarah Archer Countess Plymouth and Amherst (age 16) were married. She by marriage Countess Plymouth. He the son of Other Lewis Windsor 4th Earl Plymouth and Catherine Archer Countess Plymouth (age 41). They were first cousins.

On 01 Jun 1780 Alexander Lindsay 6th Earl Balcarres (age 28) and Elizabeth Bradshaigh Dalrymple Countess Balcarres were married. She by marriage Countess Balcarres. They had five children He the son of James Lindsay 5th Earl Balcarres and Anne Dalrymple Countess Balcarres (age 53). They were first cousins.

On 05 May 1782 George Waldegrave 4th Earl Waldegrave (age 30) and Elizabeth Laura Waldegrave Countess Waldegrave (age 22) were married. She the daughter of James Waldegrave 2nd Earl Waldegrave and Maria Walpole Duchess Gloucester and Edinburgh (age 45). He the son of John Waldegrave 3rd Earl Waldegrave (age 64) and Elizabeth Leveson-Gower Countess Waldegrave (age 58). They were first cousins. He a great x 2 grandson of King James II of England Scotland and Ireland. She a great x 2 granddaughter of King James II of England Scotland and Ireland.

On 25 Jan 1783 John Evans 6th Baron Carbery (age 17) and Catherine Charlotte Gore Baroness Carbery (age 16) were married. She the daughter of Arthur Saunders Gore 2nd Earl Arran (age 48) and Catherine Annesley. They were first cousins.

On 26 May 1783 John Aubrey 6th Baronet (age 43) and Martha Catherine Carter (age 18) were married. The difference in their ages was 25 years. They were first cousins.

01 Nov 1784 01 Nov 1784 Edward Nightingale 10th Baronet (age 24) and Eleanor Nightingale Lady Nightingale were married at, firstly, Gretna Green, Dumfrieshire, and secondly, The Parish Church of St Peter and St Paul, Bassingbourn [Map]. They were first cousins.

Before 15 Nov 1786 Richard Temple 7th Baronet (age 55) and Anne Sophia Temple were married. They were first cousins.

On 17 Sep 1787 William Henry Vane 1st Duke Cleveland (age 21) and Catharine Margaret Powlett Countess Darlington (age 21) were married at her father's seat Hackwood Park, Hampshire. She the daughter of Harry Powlett 6th Duke Bolton (age 66) and Katherine Lowther Duchess of Bolton (age 51). He the son of Henry Vane 2nd Earl Darlington (age 60) and Margaret Lowther Countess Darlington (age 59). They were first cousins. He a great x 2 grandson of King Charles II of England Scotland and Ireland.

On 18 Jun 1790 Reverend John Molesworth (age 26) and Catherine St Aubyn were married. They were first cousins.

On 31 Jul 1790 Frederick VI King Denmark and Norway (age 22) and Marie Sophie Hesse-Kassel Queen Consort Denmark and Norway (age 22) were married. He the son of Christian VII King Denmark and Norway (age 41) and Caroline Matilda Hanover Queen Consort Denmark and Norway. They were first cousins. He a great grandson of King George II of Great Britain and Ireland. She a great granddaughter of King George II of Great Britain and Ireland.

On 05 Jan 1791 John Villiers 3rd Earl Clarendon (age 33) and Maria Forbes Countess Clarendon (age 29) were married. He the son of Thomas Villiers 1st Earl Clarendon and Charlotte Capell Countess Clarendon. They were first cousins.

On 04 Mar 1792 John Hamilton 1st Marquess Abercorn (age 35) and Cecil Hamilton Marchioness Abercorn (age 21) were married. She by marriage Marchioness Abercorn. They were divorced in Apr 1799. She married the Joseph Copley 3rd Baronet (age 22) the following month; he being the brother of the Marquess' first wife Catherine Moyle Marchioness Abercorn. They were first cousins.

On 08 Apr 1795 King George IV of Great Britain and Ireland (age 32) and Caroline of Brunswick Queen Consort England (age 26) were married at Chapel Royal, St James's Palace. He the son of King George III of Great Britain and Ireland (age 56) and Charlotte Mecklenburg Strelitz Queen Consort England (age 50). They were first cousins. She a great granddaughter of King George II of Great Britain and Ireland.

In or before 1797 Very Reverend William John Digby (age 67) and Mary Digby were married. They were first cousins.

On 08 Apr 1797 George Augustus Herbert 11th Earl Pembroke 8th Earl Montgomery (age 37) and Elisabeth Beauclerk were married. He the son of Henry Herbert 10th Earl Pembroke 7th Earl Montgomery and Elizabeth Spencer Countess Pembroke and Montgomery (age 60). They were first cousins. She a great x 2 granddaughter of King Charles II of England Scotland and Ireland.

In 1798 John Hope 4th Earl Hopetoun (age 32) and Elizabeth Vere Hope were married. He the son of John Hope 2nd Earl Hopetoun and Jane Oliphant Countess Hopetoun. They were first cousins.

On 10 Jun 1799 Duke Louis Antoine of Angoulême (age 23) and Duchess Marie-Thérèse Duchess of Angoulême (age 20) were married. She the daughter of Louis XVI King France and Queen Marie Antoinette of France. He the son of King Charles X of France (age 41) and Maria Teresa of Savoy (age 43). They were first cousins. He a great x 4 grandson of King Charles I of England, Scotland and Ireland. She a great x 5 granddaughter of King Charles I of England, Scotland and Ireland.

On 20 Oct 1800 Somerset Lowry-Corry 2nd Earl Belmore (age 26) and Juliana Butler Countess Belmore (age 17) were married. He the son of Armar Lowry-Corry 1st Earl Belmore (age 60) and Margaret Butler. They were first cousins.

On 24 Nov 1800 Mathew Wilson of Eshton Hall (age 28) and Margaret Clive Wilson (age 36) were married. They were first cousins.

On 27 Aug 1801 Edmund Bacon 10th and 9th Baronet (age 22) and Mary Anne Elizabeth Bacon (age 23) were married. They were first cousins.

In 1803 George Murray 5th Earl Dunmore (age 40) and Susan Hamilton Countess Dunmore (age 29) were married. She the daughter of Archibald Hamilton 9th Duke Hamilton 6th Duke Brandon (age 62) and Harriet Stewart Duchess Hamilton Duchess Brandon. He the son of John Murray 4th Earl Dunmore (age 73) and Charlotte Stewart Countess Dunmore (age 73). They were first cousins.

On 19 Jun 1804 Louis Hesse Darmstadt II Grand Duke (age 26) and Princess Wilhelmine Baden (age 15) were married. She by marriage Grand Duchess of Hesse and by Rhine. They were first cousins.

On 21 Jun 1806 King Christian I of Norway and VIII of Denmark (age 19) and Duchess Charlotte Frederica of Mecklenburg-Schwerin (age 21) were married. They were first cousins.

On 08 Jul 1806 Charles William Wentworth-Fitzwilliam and Anne Dundas were married. He the son of Charles Wentworth-Fitzwilliam 5th and 3rd Earl Fitzwilliam (age 20) and Mary Dundas (age 19). They were first cousins.

Before 1807 Charles Wentworth-Fitzwilliam 5th and 3rd Earl Fitzwilliam (age 20) and Mary Dundas (age 19) were married. He the son of William Fitzwilliam 4th and 2nd Earl Fitzwilliam (age 58) and Charlotte Ponsonby Countess Fitzwilliam. They were first cousins.

On 23 Jun 1808 Arthur John Henry Somerset (age 28) and Elizabeth Bocawen were married. He the son of Henry Somerset 5th Duke Beaufort and Elizabeth Boscawen Duchess Beaufort (age 61). They were first cousins.

On 21 Oct 1809 Booth Grey (age 26) and Sophia Grey (age 32) were married. She the daughter of George Grey 5th Earl Stamford 1st Earl Warrington (age 72) and Henrietta Bentinck Countess Stamford and Warrington (age 72). They were first cousins.

On 04 Dec 1809 Richard Brooke 6th Baronet (age 24) and Harriet Cunliffe Lady Brooke were married. She by marriage Lady Brooke of Norton Priory in Cheshire. They were first cousins.

In 1810 King Christian I of Norway and VIII of Denmark (age 23) and Duchess Charlotte Frederica of Mecklenburg-Schwerin (age 25) were divorced after her alleged affair with her singing teacher Édouard Du Puy. She was exiled; she never saw her one year old son again.

On 04 Jul 1811 Lieutenant-General William Fitzroy (age 37) and Elizabeth Fitzroy were married. She the daughter of Augustus Henry Fitzroy 3rd Duke Grafton and Elizabeth Wrottesley Duchess Grafton (age 65). They were first cousins. He a great x 3 grandson of King Charles II of England Scotland and Ireland. She a great x 3 granddaughter of King Charles II of England Scotland and Ireland.

In or before 1813 William Cunnington (age 22) and Elizabeth Cunnington were married. She the daughter of William Cunnington and Mary Meares. They were first cousins.

On 17 Feb 1813 Frederick Collings Lukis (age 24) and Elizabeth Collings (age 21) were married. They had three daughters and six sons. They were first cousins.

On 02 Jun 1814 Lieutentnant-Colonel John Horace Thomas Stapleton (age 15) and Georgiana Maria Fitzroy (age 29) were married. They were first cousins. He a great x 3 grandson of King Charles II of England Scotland and Ireland. She a great x 3 granddaughter of King Charles II of England Scotland and Ireland.

On 29 Jun 1814 John James and Emily Jane Stewart Viscountess Hardinge (age 25) were married. She the daughter of Robert Stewart 1st Marquess Londonderry (age 74) and Frances Pratt Marchioness Londonderry (age 63). They were first cousins.

Before 08 Feb 1815 John Henry Smyth (age 34) and Elizabeth Anne Fitzroy (age 27) were married. She the daughter of George Henry Fitzroy 4th Duke Grafton (age 55) and Charlotte Maria Waldegrave. They were first cousins. He a great x 4 grandson of King Charles II of England Scotland and Ireland. She a great x 3 granddaughter of King James II of England Scotland and Ireland.

On 09 Dec 1815 Lawrence Palk 3rd Baronet (age 22) and Anna Eleanora Wrey Lady Palk (age 25) were married. She by marriage Lady Palk of Haldon House in Devon. They were first cousins.

On 22 Jul 1816 William Frederick Hanover 2nd Duke Gloucester and Edinburgh (age 40) and Mary Hanover Duchess Gloucester and Edinburgh (age 40) were married at St James's Palace [Map]. She by marriage Duchess Gloucester and Edinburgh. She the daughter of King George III of Great Britain and Ireland (age 78) and Charlotte Mecklenburg Strelitz Queen Consort England (age 72). He the son of William Henry Hanover 1st Duke Gloucester and Edinburgh and Maria Walpole Duchess Gloucester and Edinburgh. They were first cousins. He a great grandson of King George II of Great Britain and Ireland.

On 13 Jan 1819 George Spencer-Churchill 6th Duke Marlborough (age 25) and Jane Stewart Duchess Marlborough (age 21) were married. She the daughter of George Stewart 8th Earl Galloway (age 50) and Jane Paget Countess Galloway (age 44). He the son of George Spencer-Churchill 5th Duke Marlborough (age 52) and Susan Stewart Duchess Marlborough (age 51). They were first cousins.

On 22 Jul 1819 Henry Duncan Twysden (age 24) and Mary Twysden were married. They were first cousins.

On 20 Mar 1821 Edward Perceval (age 25) and Jane Perceval (age 20) were married. They were first cousins.

On 31 May 1822 Charles Berney Petre (age 27) and Elizabeth Howard were married. They were first cousins. He a great x 4 grandson of King Charles II of England Scotland and Ireland.

On 24 Feb 1823 Henry Wilson 11th Baron Berners (age 26) and Mary Letitia Crump Baroness Berners (age 22) were married. They were first cousins.

In 1824 George Harry Grey 8th Baron Grey of Groby (age 21) and Katherine Charteris Baroness Grey Groby (age 23) were married. She the daughter of Francis Charteris 8th Earl Wemyss Douglas 4th Earl March (age 51). He the son of George Grey 6th Earl Stamford 2nd Earl Warrington (age 58) and Henrietta Charteris Countess Stamford and Warrington. They were first cousins.

On 30 May 1825 Granville Dudley Ryder (age 25) and Georgiana Augusta Somerset (age 24) were married. She the daughter of Henry Charles Somerset 6th Duke Beaufort (age 58) and Charlotte Sophia Leveson-Gower Duchess Beaufort (age 54). He the son of Dudley Ryder 1st Earl of Harrowby (age 62) and Susanna Leveson-Gower Countess Harrowby Lincolnshire (age 52). They were first cousins.

On 27 Mar 1826 Reverend Henry Perceval (age 26) and Catherine Isabella Drummond were married. They were first cousins.

On 22 Jun 1826 James Henry Legge Dutton 3rd Baron Sherborne (age 22) and Elizabeth Howard Baroness Sherborne (age 23) were married. She the daughter of Thomas Howard 16th Earl Suffolk 9th Earl Berkshire (age 49) and Elizabeth Jane Dutton Countess Suffolk and Berkshire (age 51). They were first cousins.

On 02 Aug 1826 John Jervis Tollemache 1st Baron Tollemache (age 20) and Georgiana Louisa Best (age 17) were married. They were first cousins.

On 15 Jan 1827 William Worsley 1st Baronet (age 34) and Sarah Philadephia Cayley Baroness Worlsley (age 25) were married. They were first cousins.

On 27 Sep 1827 Henry Bourchier Wrey 9th Baronet (age 30) and Ellen Maria Toke (age 26) were married at St James' Church, Piccadilly. They were first cousins.

On 31 Mar 1829 William Brodrick (age 30) and Harriet Brodrick were married. They were first cousins.

In 1830 Francis Henry Dickinson (age 16) and Caroline Carey were married. They were first cousins.

In 1832 General William Carr Beresford 1st Viscount Beresford (age 63) and Louisa Beresford Viscountess Beresford were married. There was no issue. She by marriage Viscountess Beresford of Beresford in Staffordshire. He the illegitmate son of George de la Poer Beresford 1st Marquess Waterford. They were first cousins.

On 13 Apr 1832 Reverend Robert Wilson (age 30) and Harriet Crump were married. They were first cousins.

On 30 Apr 1833 Patrick John Nugent (age 29) and Catherine Vesey were married. They were first cousins.

In 1834 George Cary Elwes (age 28) and Arabella Elizabeth Sophia Heneage were married. They were first cousins. She a great x 4 granddaughter of King Charles II of England Scotland and Ireland.

In 1834 Brook William Bridges 1st Baron FitzWalter (age 32) and Fanny Cage were married. They were first cousins.

On 12 Apr 1836 Edward North Buxton 2nd Baronet (age 23) and Catherine Gurney Lady Buxton (age 22) were married. They were first cousins.

On 13 Jul 1836 Henry Cadogan 4th Earl Cadogan (age 24) and Mary Sarah Wellesley Countess Cadogan (age 27) were married at Durham Cathedral [Map]. He the son of George Cadogan 3rd Earl Cadogan (age 53). They were first cousins.

On 24 Feb 1837 Benjamin Lee Guiness 1st Baronet (age 38) and Elizabeth Guiness (age 23) were married. They were first cousins.

Before 28 May 1838 Francis Chaplin and Elizabeth Chaplin were married. They were first cousins.

On 09 Aug 1838 Charles Frederick Ashley-Cooper Ponsonby 2nd Baron de Mauley (age 22) and Maria Jane Elizabeth Ponsonby Baroness Mauley (age 19) were married. She the daughter of John Ponsonby 4th Earl Bessborough (age 56) and Maria Fane. They were first cousins.

On 29 Jan 1839 Charles Darwin (age 29) and Emma Wedgwood (age 30) were married. They were first cousins.

In 1840 Anthony Rothschild 1st Baronet (age 29) and Louisa Montefiore Lady Rothschild (age 18) were married. They were first cousins.

In 1840 Henry Labouchere 1st Baron Taunton (age 41) and Frances Baring (age 27) were married. They were first cousins.

On 26 Nov 1840 John Simeon 3rd Baronet (age 25) and Jane Maria Baker Lady Simeon were married. They were first cousins.

In 1842 Nathaniel de Rothschild (age 29) and Charlotte de Rothschild (age 16) were married. They were first cousins.

On 06 Apr 1842 Mayer Carl Freiherr von Rothschild (age 21) and Louise de Rothschild (age 22) were married. They were first cousins.

On 23 Jun 1844 Charles Stanley Monck 4th Viscount Monck (age 24) and Elizabeth Louise Mary Monck were married. She the daughter of Henry Monck 1st Earl of Rathdowne (age 58). They were first cousins.

On 04 Feb 1845 Thomas Fowell Buxton (age 22) and Rachel Jane Gurney (age 21) were married. They were first cousins.

Before 05 Aug 1845 Algernon Henry Capell (age 39) and Caroline Paget (age 34) were married. They were first cousins.

On 07 Aug 1845 Reverend Edward Royds (age 24) and Anne Mary Littledale (age 25) were married at St Mary's Church, Walton-on-the-Hill. They were first cousins.

On 17 Nov 1846 Vice-Admiral Henry Bagot (age 36) and Wilhemina Frederica Bagot were married. He the son of Bishop Richard Bagot (age 63) and Harriet Villiers (age 58). They were first cousins.

On 24 Nov 1846 Lieutenant-General Richard Wilbraham (age 35) and Elizabeth Frances Egerton were married. They were first cousins.

On 22 Feb 1848 Reverend Frederick John Norman (age 33) and Adeliza Elizabeth Gertrude Manners (age 37) were married. She the daughter of John Henry Manners 5th Duke Rutland (age 70) and Elizabeth Howard Duchess Rutland. They were first cousins.

On 29 Sep 1848 William Wells Addington 3rd Viscount Sidmouth (age 24) and Georgiana Susan Pellew Viscountess Sidmouth (age 18) were married. They were first cousins.

On 23 May 1849 Charles Edward Petre (age 25) and Charlotte Elizabeth Petre (age 27) were married. They were first cousins. He a great x 5 grandson of King Charles II of England Scotland and Ireland. She a great x 5 granddaughter of King Charles II of England Scotland and Ireland.

On 24 May 1849 Henry Reynolds-Moreton 3rd Earl of Ducie (age 21) and Julia Langston Countess Ducie (age 19) were married. He the son of Henry Reynolds-Moreton 2nd Earl Ducie (age 47) and Elizabeth Dutton Countess Ducie (age 42). They were first cousins.

On 10 Mar 1851 Henry William Parnell 3rd Baron Congleton (age 41) and Caroline Margaret Dawson were married. They were first cousins.

On 26 Sep 1851 William Tollemache (age 31) and Katherine Elizabeth Camilla Burke (age 31) were married at the Church of St John, East Horrington. He the son of Lionel Tollemache 8th Earl Dysart (age 56) and Maria Elizabeth Toone Countess Dysart. They were first cousins.

On 18 Oct 1851 George Spencer-Churchill 6th Duke Marlborough (age 57) and Jane Francis Stewart Duchess Marlborough were married. She by marriage Duchess Marlborough. He the son of George Spencer-Churchill 5th Duke Marlborough and Susan Stewart Duchess Marlborough. They were first cousins.

On 29 Nov 1851 Frederick William Cadogan (age 29) and Adelaide Paget (age 31) were married. She the daughter of Henry William Paget 1st Marquess Anglesey (age 83) and Charlotte Cadogan Marchioness Anglesey (age 70). He the son of George Cadogan 3rd Earl Cadogan (age 68). They were first cousins.

On 28 Apr 1852 Watkin Williams-Wynn 6th Baronet (age 31) and Marie Emily Williams-Wynn Lady Williams-Wynn were married. She by marriage Lady Williams of Gray's Inn. They were first cousins. He a great x 5 grandson of King James II of England Scotland and Ireland.

On 28 Apr 1852 Hugh Lupus Grosvenor 1st Duke Westminster (age 26) and Constance Leveson-Gower Duchess Westminster (age 17) were married. Their first son Victor Alexander Grosvenor was born a year later to the day. She the daughter of George Sutherland Leveson-Gower 2nd Duke Sutherland (age 65) and Harriet Elizabeth Georgiana Howard Duchess Sutherland (age 45). He the son of Richard Grosvenor 2nd Marquess Westminster (age 57) and Elizabeth Mary Leveson-Gower Marchioness Westminster (age 55). They were first cousins.

On 08 Jun 1852 Dudley Francis Fortescue (age 31) and Camilla Eleanor Wallop were married. She the daughter of Newton Wallop aka Fellowes 4th Earl of Portsmouth (age 79) and Catherine Fortescue Countess Portsmouth (age 65). He the son of Hugh Fortescue 2nd Earl Fortescue (age 69) and Susan Ryder. They were first cousins.

On 15 Feb 1853 Ralph Tollemache (age 26) and Caroline Tollemache (age 24) were married. They were first cousins.

On 10 Sep 1853 Henry Gerard Sturt 1st Baron Alington (age 28) and Augusta Bingham Baroness Alington (age 21) were married. She the daughter of George Charles Bingham 3rd Earl Lucan (age 53) and Anne Brudenell Countess Lucan (age 44). They were first cousins.

Before 05 Nov 1853 Charles Vere Ferrars Townshend (age 68) and Charlotte Elizabeth Loftus were married. He the son of George Townshend 2nd Marquess Townshend and Charlotte Mainwaring Ellerker Countess of Leicester. They were first cousins.

On 27 Feb 1854 General George Augustus Frederick Paget (age 35) and Agnes Charlotte Paget were married. He the son of Henry William Paget 1st Marquess Anglesey (age 85) and Charlotte Cadogan Marchioness Anglesey. They were first cousins.

On 29 Mar 1855 Charles Buckworth-Herne-Soame 9th Baronet (age 24) and Mary Proctor Lady Buckworth-Herne-Soame were married. They were first cousins. He a great x 5 grandson of King Charles II of England Scotland and Ireland.

On 17 Apr 1855 William Fitzclarence 2nd Earl Munster (age 30) and Wilhelmina Kennedy-Erskine (age 24) were married. He the son of George Fitzclarence 1st Earl Munster and Mary Wyndham Countess Munster. They were first cousins. He a grandson of King William IV of the United Kingdom. She a granddaughter of King William IV of the United Kingdom.

On 17 Jan 1856 Lieutenant-General Edward Thomas Gage (age 30) and Arabella Elizabeth Gage were married. They were first cousins.

Before 13 Nov 1856 Reverend Brooke William Boothby 9th Baronet (age 47) and Martha Serena Boothby were married. They were first cousins.

On 02 Dec 1856 Frederick Charles George Fitzclarence (age 30) and Adelaide Augusta Willhelmina Sidney were married. He the son of George Fitzclarence 1st Earl Munster and Mary Wyndham Countess Munster. They were first cousins. He a grandson of King William IV of the United Kingdom. She a granddaughter of King William IV of the United Kingdom.

Before 22 Mar 1857 Lionel Eldred Smith-Gordon 2nd Baronet (age 23) and Fanny Pottinger Lady Smith (age 24) were married. She by marriage Lady Smith-Gordon of Jamaica. They were first cousins.

On 12 Aug 1857 William Schomberg Kerr 8th Marquess Lothian (age 25) and Constance Harriet Mahonesa Talbot Marchioness Lothian (age 21) were married. She by marriage Marchioness Lothian. She the daughter of Henry John Chetwynd-Talbot 3rd Earl Talbot 18th Earl of Shrewsbury (age 53) and Sarah Elizabeth Beresford Countess Talbot Shrewsbury Waterford (age 49). He the son of John Kerr 7th Marquess Lothian and Cecil Chetwynd-Talbot Marchioness Lothian (age 49). They were first cousins.

In 1858 Charles Hepburn-Stuart-Forbes-Trefusis 20th Baron Clinton (age 23) and Harriet Williamina Hepburn-Forbes Baroness Clinton (age 23) were married at Fasque, Fettercairn. They were first cousins.

On 14 Dec 1859 George Venables-Vernon aka Warren 5th Baron Vernon (age 56) and Frances Maria Emma Boothby were married. They were first cousins.

Before 1865 Richard Arabin (age 53) and Elizabeth Mary Meux (age 45) were married. They were first cousins.

On 03 Aug 1865 Edward Cavendish (age 27) and Emma Elizabeth Lascelles were married. He the son of William Cavendish 7th Duke Devonshire (age 57) and Blanche Georgiana Howard Duchess Devonshire. They were first cousins.

On 11 May 1867 Edmund Henry Mildmay (age 52) and Augusta Jane St John-Mildmay were married. He the son of Henry St John-Mildmay 4th Baronet and Harriett Bouverie Countess Camden. They were first cousins. She a great x 4 granddaughter of King James II of England Scotland and Ireland.

Before 06 Jan 1870 Francis Augustus Fane (age 45) and Augusta Fane (age 38) were married. They were first cousins.

On 03 Feb 1876 Algernon Charles Fountaine (age 24) and Mary Fountaine (age 28) were married by which Narford Ha was retained by the Fountaine family. They were first cousins.

On 03 Aug 1876 Bernard Coleridge 2nd Baron Coleridge (age 24) and Mary Alethea Mackarness Baroness Coleridge were married. They were first cousins.

In 1878 Henry Howard Molyneux Herbert 4th Earl Carnarvon (age 46) and Elizabeth Catherine Howard-Molyneux-Howard Countess Carnarvon (age 21) were married. She by marriage Countess Carnarvon. The difference in their ages was 24 years. He the son of Henry John George Herbert 3rd Earl Carnarvon and Henrietta Anna Howard-Molyneux-Howard Countess Carnarvon. They were first cousins.

On 26 Aug 1884 Herbert Lloyd Watkin Williams-Wynn 7th Baronet (age 24) and Louisa Alexandra Williams-Wynn Lady Williams-Wynn (age 19) were married. They divorced in 1898 having had three children. They were first cousins.

On 06 Jun 1885 William Parker 2nd Baronet (age 60) and Jane Constance Biddulph were married. They were first cousins.

On 02 Mar 1886 Charles Frederick Heneage Bagot (age 28) and Florence Eleanor Bagot were married. They were divorced in 1906. They were first cousins.

On 24 May 1888 Prince Henry Hohenzollern (age 25) and Irene Hesse Darmstadt (age 21) were married. She the daughter of Prince Louis Hesse Darmstadt IV Grand Duke (age 50) and Princess Alice Saxe Coburg Gotha. He the son of Frederick III King Prussia (age 56) and Victoria Empress Germany Queen Consort Prussia (age 47). They were first cousins. He a grandson of Queen Victoria of the United Kingdom. She a granddaughter of Queen Victoria of the United Kingdom.

On 04 Jun 1889 John Douglas-Scott-Montagu 2nd Baron Montagu of Beaulieu (age 22) and Cecil Victoria Kerr Baroness Montagu of Beaulieu (age 23) were married. She the daughter of Schomberg Henry Kerr Kerr 9th Marquess Lothian (age 55) and Victoria Alexandrina Montagu-Douglas-Scott Marchioness Lothian (age 44). They were first cousins.

On 17 Apr 1890 Charles Hardinge 1st Baron Penshurt (age 31) and Winifred Selina Sturt (age 22) were married. They were first cousins.

In 1892 Lionel Sackville-West 3rd Baron Sackville (age 24) and Victoria Sackville-West Baroness Sackville were married. They were first cousins.

On 02 Jul 1892 Lt Colonel Hugh Annesley 5th Earl Annesley (age 61) and Priscilla Cecilia Moore Countess Annesley were married at St Marylebone Church. She by marriage Countess Annesley of Castlewellan in County Down. He the son of William Richard Annesley 3rd Earl Annesley and Priscilla Cecilia Moore. They were first cousins.

On 19 Aug 1892 Lieutenant Mark McDonnell (age 40) and Emily Fanny Dorothy Osborn were married. He the son of Mark Kerr aka McDonnell 5th Earl of Antrim and Jane Macan Countess of Antrim. They were first cousins.

On 18 Jul 1893 Henry Robert Beauclerk Coventry (age 21) and Mary Muriel Sophie Howard (age 23) were married. She the daughter of Henry Charles Howard 18th Earl Suffolk 11th Earl Berkshire (age 59) and Mary Eleanor Coventry Countess Suffolk and Berkshire (age 45). They were first cousins.

On 19 Apr 1894 Ernest Louis Hesse Darmstadt Grand Duke (age 25) and Victoria Melita Windsor (age 17) were married. She the daughter of Prince Alfred Windsor (age 49) and Maria Holstein Gottorp Romanov (age 40). He the son of Prince Louis Hesse Darmstadt IV Grand Duke and Princess Alice Saxe Coburg Gotha. They were first cousins. He a grandson of Queen Victoria of the United Kingdom. She a granddaughter of Queen Victoria of the United Kingdom.

In 1896 Haakon VII King Norway (age 23) and Maud Windsor Queen Consort Norway (age 26) were married. She the daughter of King Edward VII of the United Kingdom (age 54) and Alexandra Glücksburg Queen Consort England (age 51). He the son of Frederick VIII King Denmark (age 52) and Louise of Sweden Queen Consort Denmark (age 44). They were first cousins. He a great x 4 grandson of King George II of Great Britain and Ireland.

On 20 Jan 1898 Henry Cyril "Toppy" Paget 5th Marquess Anglesey (age 22) and Lilian Florence Chetwynd Marchionness of Anglsey (age 21) were married in a Catholic ceremony at The Church of the Holy and Undivided Trinity with Saint Jude, Sloane Street. She the daughter of George Chetwynd 4th Baronet (age 48) and Florence Cecilia Paget Marchioness Hastings (age 55). He the son of Henry Paget 4th Marquess Anglesey (age 62) and Blanche Mary Boyd. They were first cousins.

On 07 Nov 1900 Lilian Florence Chetwynd Marchionness of Anglsey (age 24) obtained a decree nisi. The marriage of Henry Cyril "Toppy" Paget 5th Marquess Anglesey (age 25) and Lilian Florence Chetwynd Marchionness of Anglsey (age 24) was later annulled on the grounds of non-consummation.

In 1901 Ernest Louis Hesse Darmstadt Grand Duke (age 32) and Victoria Melita Windsor (age 24) were divorced.

On 08 Oct 1905 Cyril Vladimirovich Holstein Gottorp Romanov (age 28) and Victoria Melita Windsor (age 28) were married. She the daughter of Prince Alfred Windsor and Maria Holstein Gottorp Romanov (age 51). They were first cousins. She a granddaughter of Queen Victoria of the United Kingdom.

On 18 Feb 1908 George Beresford Plumptre (age 38) and Mary Augusta Plumptre (age 34) were married. They were first cousins.

On 25 Nov 1909 Clement Freeman-Mitford and Helen Alice Wyllington Ogilvy (age 19) were married. She the daughter of David Ogilvy 11th Earl of Airlie and Mabell Gore Countess Airlie (age 43). They were first cousins.

On 19 Aug 1913 Walter Yarde-Buller (age 54) and Alianore Chandos-Pole Lady Lethbridge (age 44) were married. They were first cousins. She a great x 5 granddaughter of King Charles II of England Scotland and Ireland.

On 10 Nov 1913 Thomas Palk Carew 10th Baronet (age 23) and Ivy Madeline Laura Breakey were married. They were divorced in 1921. They were first cousins.

On 22 May 1919 Prince Axel of Denmark (age 30) and Princess Ingeborg Glücksburg (age 40) were married at Stockholm Cathedral. She the daughter of Frederick VIII King Denmark and Louise of Sweden Queen Consort Denmark (age 67). They were first cousins. He a great x 4 grandson of King George II of Great Britain and Ireland. She a great x 4 granddaughter of King George II of Great Britain and Ireland.

On 12 Sep 1925 Major Terence Eden 8th Baron Auckland (age 32) and Evelyn Vane Drummond of Cromlix Baroness Auckland (age 20) were married. They were first cousins.

In or before 1926 Richard James Graham 4th Baronet (age 67) and Mabel Cynthia Duncombe Lady Graham were married. She by marriage Lady Graham of Netherby in Cumberland. She the daughter of William Duncombe 1st Earl Feversham and Mabel Violet Graham Countess Feversham. They were first cousins.

On 18 Oct 1928 Henry Neville 3rd Marquess Abergavenny (age 74) and Mary Frances Neville Marchioness Abergavenny (age 59) were married. She by marriage Marchioness Abergavenny. He the son of William Neville 1st Marquess Abergavenny and Caroline Vanden Bempte Johnston Marchioness Abergavenny. They were first cousins.

August Wilhelm Hohenzollern and Alexandra Viktoria Auguste Leopoldine Glücksburg were married. She the daughter of Friedrich Ferdinand Glücksburg Duke Schleswig Holstein Sonderburg Glücksburg and Victoria Friederike Oldenburg Duchess Schleswig Holstein Sonderburg Glücksburg. He the son of Wilhelm Hohenzollern and Empress Auguste Viktoria Oldenburg. They were first cousins. He a great grandson of Queen Victoria of the United Kingdom. She a great x 4 granddaughter of King George II of Great Britain and Ireland.

Louis Armand Bourbon Condé Conti II Prince Conti and Louise Élisabeth Bourbon Condé Princess Conti were married. She by marriage Princess Conti. They were first cousins. He a great x 3 grandson of King James I of England and Ireland and VI of Scotland. She a great x 3 granddaughter of King James I of England and Ireland and VI of Scotland.

Helier Carteret and Margaret Carteret were married. The difference in their ages was 23 years; she, unusually, being older than him. They were first cousins.

Henry James Montagu Scott 2nd Baron Montagu and Jane Margaret Douglas Baroness Montagu were married. He the son of Henry Scott 3rd Duke Buccleuch and Elizabeth Montagu Duchess Buccleuch. They were first cousins. He a great x 4 grandson of King Charles II of England Scotland and Ireland. She a great x 4 granddaughter of King Charles II of England Scotland and Ireland.

Iorwerth "Drwyndwn aka Flat Nosed" Aberffraw and Marared ferch Madog Mathrafal were married. She the daughter of Madog ap Maredudd Mathrafal Prince Powys and Susanna Aberffraw. He the son of Owain "Great" King Gwynedd and Gwladus Unknown Queen Consort Gwynedd. They were first cousins.

Wriothesley Russell and Elizabeth Laura Henrietta Russell were married. He the son of John Russell 6th Duke Bedford and Georgiana Gordon Duchess Bedford. They were first cousins. He a great x 3 grandson of King Charles II of England Scotland and Ireland. She a great x 3 granddaughter of King Charles II of England Scotland and Ireland.

William Bertie and Anne Bulkeley were married. They were first cousins.

Lionel Boyle 3rd Earl Orrery and Mary Sackville Countess Orrery were married. She the illegitmate daughter of Charles Sackville 6th Earl Dorset 1st Earl Middlesex. He the son of Roger Boyle 2nd Earl Orrery and Mary Sackville Countess Orrery. They were first cousins.

Henry Bertie and Mary Bertie were married. He the son of James Bertie 1st Earl of Abingdon and Eleanor Lee Countess Abingdon. They were first cousins.

Before Cospatrick Alexander Douglas-Home 11th Earl of Home and Lucy Elizabeth Montagu Scott Countess Home were married. He the son of Alexander Ramey Home 10th Earl of Home and Elizabeth Scott Countess Home. They were first cousins. He a great x 5 grandson of King Charles II of England Scotland and Ireland. She a great x 5 granddaughter of King Charles II of England Scotland and Ireland.

Bernard VII Count Armagnac and Bonne Valois Countess Armagnac and Savoy were married. She by marriage Countess Armagnac. She the daughter of John Valois 1st Duke Berry and Joanne Armagnac Duchess Berry. He the son of John II Count Armagnac and Jeanne Countess Armagnac. They were first cousins.

Nicolas Lorraine II Duke Lorraine and Claude Lorraine Duchess Lorraine were married. She the daughter of Henry Lorraine II Duke Lorraine and Margherita Gonzaga Duchess Lorraine. He the son of Francis Lorraine II Duke Lorraine. They were first cousins.

James Douglas 1st Baronet and Catherine Douglas Lady Kelhead were married. She the daughter of James Douglas 2nd Earl Queensberry and Margaret Stewart Countess Queensberry. They were first cousins.

John Manners-Sutton and Anne Manners were married. They were first cousins.

Ferdinand of Spain II Holy Roman Emperor and Maria Anna Wittelsbach Holy Roman Empress were married. She by marriage Holy Roman Empress. She the daughter of William Wittelsbach V Duke Bavaria and Renata Lorraine Duchess Bavaria. They were first cousins.

Albert Habsburg Spain VII Archduke Austria and Infanta Isabella Habsburg Spain were married. She the daughter of Philip "The Prudent" II King Spain and Elizabeth Valois Queen Consort Spain. He the son of Maximilian Habsburg Spain II Holy Roman Emperor and Maria of Spain Holy Roman Empress. They were first cousins.

Charles Gordon 2nd Earl Aboyne and Elizabeth Lyon Countess Aboyne were married. She the daughter of Patrick Lyon 3rd Earl Strathmore and Kinghorne and Helen Middleton Countess Strathmore and Kinghorne. He the son of Charles Gordon 1st Earl Aboyne and Elizabeth Lyon Countess Aboyne. They were first cousins.

Theobald Butler and Elizabeth Butler were married. She the daughter of Thomas "Black Tom" Butler 10th Earl Ormonde 3rd Earl Ossory and Elizabeth Sheffield Countess Ormonde and Ossory. They were first cousins.

Owain Fychan ap Madog Mathrafal Prince Powys Fadog and Angharad Aberffraw were married. She the daughter of Owain "Great" King Gwynedd. He the son of Madog ap Maredudd Mathrafal Prince Powys and Susanna Aberffraw. They were first cousins.

John Finch and Elizabeth Savile were married. He the son of Heneage Finch 1st Earl Aylesford and Elizabeth Banks Countess Aylesford. They were first cousins.

Charles Tryon and Jane Savile were married. They were first cousins.