15 Oct is in October.
1517 Sweating Sickness Outbreak
1518 Betrothal of Mary Tudor and the Dauphin
1537 Birth and Christening Edward VI
1551 Arrest of the Duke of Somerset and his Supporters
On 15 Oct 1066 Edgar Ætheling II King England (age 15) was appointed II King England.
Anglo-Saxon Chronicle. 1072. This year died Bishop Aylric. He had been invested Bishop of York; but that see was unjustly taken from him, and he then had the bishopric of Durham given him; which he held as long as he chose, but resigned it afterwards, and retired to Peterborough minster [Map]; where he abode twelve years. After that King William (age 44) won England, then took he him from Peterborough, and sent him to Westminster; where he died on the ides of October, and he is there buried, within the minster, in the porch of St. Nicholas.
On 15 Oct 1072 Bishop Æthelric died.
Before 15 Oct 1097 Baldwin I King Jerusalem (age 39) and Godehilde Tosny were married. He the son of Eustace Flanders II Count Boulogne and Ida Ardennes Countess Boulogne.
On 15 Oct 1173 Petronilla Jiménez Queen Aragon (age 37) died.
On 15 Oct 1191 Raoul I Count of Clermont-en-Beauvaisis (age 51) was killed during the Siege of Acre.
On 15 Oct 1285 Alexander III King Scotland (age 44) and Yolande Capet Duchess Brittany (age 24) were married. She the daughter of Robert Capet IV Count Dreux and Beatrice Montfort Countess Dreux (age 36). He the son of Alexander II King Scotland and Marie Coucy. They were third cousin once removed. He a great x 3 grandson of King Henry I "Beauclerc" England. She a great x 5 granddaughter of King Henry I "Beauclerc" England. 
Archaeologia Volume 35 1853 XXXIII. Oct 1357. About the middle of October — the actual date is lost by injury of the document - the Queen (age 62) set out from Hertford on a pilgrimage to Canterbury. She rested at Tottenham, London, Eltham, Dartford, and Rochester, in going or returning visited Leeds Castle [Map], and was again at Hertford at the beginning of November.
She gave alms to the nuns minoresses without Aldgate; to the rector of St. Edmund's in London, in whose parish her hostel was situated — it was in Lombard Street; and to the prisoners in Newgate.
On 15 Oct 1361 Humphrey Bohun 6th Earl Hereford 5th Earl Essex (age 52) died. His nephew Humphrey Bohun 7th Earl Hereford 6th Earl Essex 2nd Earl of Northampton (age 20) succeeded 7th Earl Hereford 6C 1199, 6th Earl Essex 3C 1239. Joan Fitzalan Countess Essex Hereford and Northampton (age 14) by marriage Countess Essex, Countess Hereford.
Before 15 Oct 1381 William Deincourt 2nd Baron Deincourt (age 23) and Alice Neville Baroness Deincourt (age 23) were married. She by marriage Baroness Deincourt. She a great x 5 granddaughter of King Henry "Curtmantle" II of England.
On 15 Oct 1381 William Deincourt 2nd Baron Deincourt (age 23) died at Stirling [Map]. His son Ralph Deincourt 3rd Baron Deincourt (age 1) succeeded 3rd Baron Deincourt 2C 1322.
On 15 Oct 1383 Hermann II Landgrave of Hesse (age 42) and Margaret Hohenzollern (age 23) were married at Kulmbach. She by marriage Landgravine Hesse. She the daughter of Frederick Hohenzollern V Burgrave Nuremburg (age 50).
On 15 Oct 1396 John IV Count Armagnac was born to Bernard VII Count Armagnac (age 33) and Bonne Valois Countess Armagnac and Savoy (age 31). Coefficient of inbreeding 6.25%.
On 15 Oct 1440 Margrave Henry III of Upper Hesse was born to Louis I Landgrave of Hesse (age 38) and Anna of Saxong Landgravine of Hesse (age 20).
On 15 Oct 1495 Robert Drury Speaker (age 41) was appointed Speaker of the House of Commons during the 5th Parliament of Henry VII.
Letters and Papers 1517. 15 Oct 1517. Harl. 6989, f. 25. B. M. 3747. Pace (age 35) to WOLSEY.
In fear of the great plague. Young Lord Grey died of it this night. An Almain servant of the King died before him. Today arrived a Spanish friar, named by his company a saint, alleging that he worked miracles in the late tempest at sea, which ceased at his bidding, "ipso cœlo id protestante dimissis in navem magnis luminaribus." He had an hour's interview with the King, with what result Pace (age 35) knows not, except that the King esteems him more a friar than a saint. He has professed the order of St. Jerome many years; has no learning, but more than Spanish impudence. The King spends the time in hawking. Windsor, 15 Oct.
Hol., pp. 2. Add.: To my Lord Legate's grace.
On 15 Oct 1518 Mary Tudor Queen Consort France (age 22) and the Dauphin Louis XII King France were betrothed at Greenwich [Map].
Bishop Cuthbert Tunstall (age 44) delivered an oration in praise of matrimony.
Wriothesley's Chronicle. 15 Oct 1537. This yeare, the 25thd daie of October, being Moundaie, the Prince was christened in the Kinges chappell at Hampton Court, the Archbishopp of Canterberie (age 48) and the Duke of Norfoike (age 64) godfathers at the font, and my Ladie Maries grace (age 21), the Kinges daughter by Queene Katherin, godmotherb, and the Duke of Suffolke, godfather at the confirmation, the Princes name being Edwarde, proclaymed after his christning by the King of Haroldesa, "Edward, sonne and heire to the King of Englande, Duke of Cornewall, and Earle of Chester." The goodlie solempnitie of the lordes and ladies done at the christning was a goodlie sight to behoulde, everie one after their office and degree; the Ladie Elizabeth (age 4), the Kinges daughter, bearing the chrisome on her breast, the Viscoumpt Beauchampe (age 37), brother to the Queeneb, bearing her in his armes, the Earle of Essex (age 52) bearing the salte, the Ladie Marques of Exceter (age 34) bearing the Prince to the church and home againe, the Duke of Norfolke (age 64) staying his head, as she bare him, and the Duke of Suffolke (age 53) at his feete.NOTEXT
Note d. Evidently a clerical error for the 15th, which was Monday, whereas the 25th would haye been Thursday.
Note e. It is cnrions to note the incongruity of the sponsors: these were Archbishop Cranmer (age 48), the head of the Protestant Reformers, the Duke of Norfolk (age 64), leader of the lay Catholics, and the Princess Mary (age 21), a bigoted Catholic, who had been bastardised by her father.
Note a. Thomas Hawley, Clarencieux King-at-Arms.
Note b. Edward Seymour (age 37), elder brother of Queen Jane, and so brother-in-law of Henry VIII was created Viscount Beauchomp, of Hache, co. Somerset, 5th June, 1536. He was lineally descended from Sir Roger Seymour (temp. Edward III.) who married Cicely, sister and eldest coheir of John de Beauchamp, last Baron Beauchamp.
On 15 Oct 1537 the future Edward VI was christened by Bishop John Stokesley (age 62) at the Chapel Royal in Hampton Court Palace [Map]. Archbishop Thomas Cranmer (age 48) performed the Baptismal Rites, and was appointed Godfather. Thomas Howard 3rd Duke of Norfolk (age 64) and Queen Mary I of England and Ireland (age 21) were Godparents.NOTEXT
King Edward VI of England and Ireland was created Duke Cornwall, 1st Earl Chester 9C 1537.
Henry Bourchier 2nd Earl Essex 3rd Count Eu carried the Salt. Charles Brandon 1st Duke of Suffolk (age 53) was Godfather and supported the Marchioness of Exeter. Richard Long (age 43) was knighted. Thomas Cromwell 1st Earl Essex (age 52), Philip Boteler (age 45), John de Vere 15th Earl of Oxford (age 66) and John Gage (age 57) attended. Mary Scrope (age 61) carried Lady Mary's train. Robert Radclyffe 1st Earl of Sussex (age 54) carried a covered basin. Robert Radclyffe 1st Earl of Sussex (age 54) carried the canopy.
Edward Seymour 1st Duke Somerset (age 37) helped his young niece the future Elizabeth I to carry the Crisom. Henry Courtenay 1st Marquess Exeter (age 41) supported his wife Gertrude Blount Marchioness of Exeter (age 34) to carry the child. Thomas Boleyn 1st Earl Wiltshire and Ormonde (age 60) bore a taper of virgin wax. William Fitzalan 18th Earl Arundel (age 61) carried the train of the Prince's robe. Christopher Barker Garter King of Arms proclaimed the Prince's titles. Arthur Hopton (age 48) attended.
Edward Seymour 1st Duke Somerset (age 37) was created 1st Earl Hertford 3C 1537.
Nicholas Carew (age 41), Francis Bryan (age 47), Anthony Browne (age 37) and John Russell 1st Earl Bedford (age 52) surrounded the font.
Henry Knyvet of Charlton Wiltshire (age 27), Edward Neville (age 66), Thomas Seymour 1st Baron Seymour (age 29), Richard Long (age 43) and John Wallop (age 47) carried the canopy.
Bishop Robert Parfew aka Warton and Bishop John Bell attended.
William Fitzwilliam 1st Earl of Southampton (age 47) was created 1st Earl of Southampton 1C 1537. Mabel Clifford Countess Southampton (age 55) by marriage Countess of Southampton.
On 15 Oct 1542 William Fitzwilliam 1st Earl of Southampton (age 52) died at Newcastle upon Tyne [Map]. Earl of Southampton 1C 1537 extinct. Anthony Browne (age 42) inherited Cowdray House [Map].
Henry Machyn's Diary. 15 Oct 1551. The xv day of October was had to the Towre the duke of Somersett (age 51) and and the lord Gray (age 42).
Note. The duke of Somerset, &c. sent to the Tower. On the particulars of these state trials it is only necessary to refer to several passages in the King's diary, and to Strype and our general historians.
On 15 Oct 1553 Thomas Saunders preached at Northampton [Map] warning the congregation that 'the errors of the popish religion' would be restored to the church by Queen Mary (age 37).
On 27 Sep 1584 or 15 Oct 1584 Bishop Thomas Watson (age 69) died at Wisbech Castle [Map] having been confined for the previous twenty-five years.
On 15 Oct 1611 John Lindsay 1st Earl Lindsay 17th Earl Crawford was born to Robert Lindsay 9th Lord Lindsay of the Byres (age 36).
Around 15 Oct 1616 Walter Scott 1st Earl Buccleuch (age 10) and Mary Hay Countess Buccleuch were married. She the daughter of Francis Hay 9th Earl Erroll (age 52) and Elizabeth Douglas Countess Erroll.
On or before 15 Oct 1635 Josias Stewart 4th Baron Castle Stuart was born to Andrew Stewart 2nd Baron Castle Stuart (age 45) and Anne Stewart Baroness Castle Stuart. Coefficient of inbreeding 1.60%. 
Evelyn's Diary. 15 Oct 1649. Came news of Drogheda being taken by the rebels, and all put to the sword, which made us very sad, forerunning the loss of all Ireland.
On 15 Oct 1651 James Stanley 7th Earl of Derby (age 44) died. His son Charles Stanley 8th Earl of Derby (age 23) succeeded 8th Earl Derby 3C 1485, 2nd Baron Strange Knockin 4C 1628.
On 15 Oct 1660 John Carew Regicide (age 38) was hanged, drawn and quartered at Charing Cross [Map].
Pepy's Diary. 15 Oct 1660. Office all the morning. my wife and I by water; I landed her at Whitefriars, she went to my father's (age 59) to dinner, it being my father's (age 59) wedding day, there being a very great dinner, and only the Fenners and Joyces there. This morning Mr. Carew (age 38)1 was hanged and quartered at Charing Cross; but his quarters, by a great favour, are not to be hanged up.
Note 1. John Carew (age 38) signed the warrant for the execution of Charles I He held the religion of the Fifth Monarchists, and was tried October 12th, 1660. He refused to avail himself of many opportunities of escape, and suffered death with much composure.
On 15 Oct 1663 Fitton Gerard 3rd Earl Macclesfield was born to Charles Gerard 1st Earl Macclesfield (age 45) and Jeanne de Civelle Countess Macclesfield.
Evelyn's Diary. 15 Oct 1675. I settled affairs, my son (age 20) being to go into France with my Lord Berkeley (age 47), designed Ambassador-extraordinary for France and Plenipotentiary for the general treaty of peace at Nimeguen.
Evelyn's Diary. 15 Oct 1677. Returned to London; in the evening, I saw the Prince of Orange (age 26), and supped with Lord Ossory (age 43).
Evelyn's Diary. 15 Oct 1685. Being the King's (age 52) birthday, there was a solemne ball at Court, and before it musiq of instruments and voices. At the musiq I happen'd by accident to stand the very next to the Queene (age 27) and the King (age 52), who talk'd with me about the musick.
On 15 Oct 1718 Florence Rolle Lady Wrey (age 66) was buried at St Peter's Church, Tawstock [Map]. The inscription: IN memory of Florence Lady Wrey Daughter of John Rolle of Stevenstone in ye County of Devon Kt of ye Bath Wife & Relict of Bourchier Wrey late of Tawstock Baron Who in every trace of Life, Somet me prosperous oftener adverse, Most happily dischargd the dutys of Virgin Wife and Widoow. The ornement & Pattern of her sex The living Image of all Virtues. For Piety especially & Humility Mix'd with sweeness of manners And engageing elegance of Person & address Superior to most second to none ob: Aug: 24, 1724. die St Barth.
Beneath rest the Remains of her Daughter Flo: Cole who died Aug 30 1718.
This Monument was erected by her son Chichester Wrey (age 32) A:M: Rectr of Tawstock MDCCXXVI.
Florence Rolle Lady Wrey: In 1652 she was born to John Rolle (age 26) and Florence Rolle (age 20). On 03 May 1681 Bourchier Wrey 4th Baronet (age 28) and Florence Rolle Lady Wrey (age 29) were married at St Giles' Church, St Giles in the Wood. She by marriage Lady Wrey of Trebitch in Cornwall. On 24 Aug 1724 Florence Rolle Lady Wrey (age 72) died.
Florence Wrey: Around 1685 she was born to Bourchier Wrey 4th Baronet (age 32) and Florence Rolle Lady Wrey (age 33). On 10 Jul 1707 John Cole (age 27) and Florence Wrey (age 22) were married. They had eight children. On 30 Aug 1718 Florence Wrey (age 33) died. She was buried at St Peter's Church, Tawstock on 15 Oct 1718.
On 15 Oct 1726 Patrick Mcdouall Crichton 6th Earl Dumfries was born.
On 15 Oct 1728 James Hamilton 1st Earl Clanbrassil (age 34) and Harriet Bentinck Countess Clanbrassil (age 22) were married. She the daughter of William Bentinck 1st Earl of Portland and Jane Martha Temple Countess Portland (age 56).
On 15 Oct 1756 William Grimston 1st Viscount Grimston (age 71) died. His son James Grimston 2nd Viscount Grimston (age 45) succeeded 2nd Viscount Grimston, 6th Baronet Grimston of Little Waltham in Essex.
On 15 Oct 1770 Norborne Berkeley 4th Baron Botetort (age 53) died in Williamsburg. Baron Botetort 1C 1305 abeyant.
On 15 Oct 1783 Francis Vernon 1st Earl Shipbrook (age 68) died.
On 15 Oct 1795 Frederick William IV King Prussia was born to Frederick William II King Prussia (age 25). He a great x 3 grandson of King George I of Great Britain and Ireland.
On 15 Oct 1806 William Clements 3rd Earl Leitrim was born to Nathaniel Clements 2nd Earl Leitrim (age 38) and Mary Bermingham.
Before 15 Oct 1811. Nathaniel Dance-Holland (age 76). Portrait of Miss Hargreaves.
Before 15 Oct 1811. Nathaniel Dance-Holland (age 76). Portrait of John Eardley-Wilmot (age 63).
John Eardley-Wilmot: In 1748 he was born to John Eardley-Wilmot (age 38). On 23 Jun 1815 John Eardley-Wilmot (age 67) died in Bengal.
Before 15 Oct 1811. Nathaniel Dance-Holland (age 76). Portrait of John Eardley-Wilmot (age 63).
Before 15 Oct 1811. Nathaniel Dance-Holland (age 76). Portrait of Charles Seymour 6th Duke Somerset.
Before 15 Oct 1811. Nathaniel Dance-Holland (age 76). Portrait of Charles Pratt 1st Earl Camden.
Before 15 Oct 1817 Andrew St John 14th Baron St John Bletso (age 58) and Louise Rouse-Boughton Baroness St John (age 32) were married. She by marriage Baroness St John Bletso. The difference in their ages was 25 years.
On 15 Oct 1817 Andrew St John 14th Baron St John Bletso (age 58) died. His son Andrew St John 15th Baron St John Bletso (age 5) succeeded 15th Baron St John Bletso 1C 1559, 12th Baronet St John of Woodford in Northamptonshire 1660.
On 15 Oct 1823 William Drogo Montagu 7th Duke Manchester was born to George Montagu 6th Duke Manchester (age 24) and Millicent Sparrow Duchess Manchester (age 25) at Kimbolton Castle [Map].
On 15 Oct 1857 Wilbraham Egerton 1st Earl Egerton (age 25) and Mary Amherst were married. She the daughter of William Amherst 2nd Earl Amherst (age 52) and Gertrude Percy Countess Amherst (age 43).
On 15 Oct 1863 Henry Byng 4th Earl Strafford (age 32) and Henrietta Louisa Elizabeth Danneskiold Samsøe Countess Strafford (age 27) were married. He the son of George Byng 2nd Earl Strafford (age 57) and Agnes Paget. They were fourth cousins.
On 15 Oct 1867 George I King Greece (age 21) and Olga Constantinovna Holstein Gottorp Romanov Queen Consort Greece (age 16) were married. She by marriage Queen Consort Greece. He the son of King Christian IX of Denmark (age 49) and Queen Louise Hesse-Kassel of Denmark (age 50). He a great x 3 grandson of King George II of Great Britain and Ireland. She a great x 5 granddaughter of King George I of Great Britain and Ireland. 
On 15 Oct 1885 Arthur Lawley 6th Baron Wenlock (age 24) and Annie Allen Cunard Baroness Wenlock (age 22) were married.
On 15 Oct 1886 Captain Philip Hamond (age 72) died.
On 01 Feb 1914 his son Charles Annesley Hamond (age 29) died.
On 05 Feb 1917 Thomas Astley Horace Hamond (age 71) died.
Memorials in All Saints Church, West Acre [Map].
Captain Philip Hamond: Around 1814 he was born to Philip Hamond of High House in West Acre in Norfolk (age 32) and Anne Packe (age 37).
Charles Annesley Hamond: On 08 Nov 1856 he was born to Captain Philip Hamond (age 42).
Thomas Astley Horace Hamond: On 17 Aug 1845 he was born to Anthony Hamond (age 41) and Mary Anne Musters (age 39).
On 15 Oct 1901 Carlos María Fitz James Stuart 16th Duke Alba 14th Duke Veragua 9th Duke Berwick (age 51) died. His son Jacobo Fitz-James Stuart 17th Duke of Alba 10th Duke of Berwick (age 22) succeeded 17th Duke Alba, 15th Duke Veragua, 10th Duke of Jérica, 10th Duke of Liria, 10th Duke Berwick.
Before 15 Oct 1906 Rupert Edward Cecil Lee Guinness 2nd Earl Iveagh (age 32) and Gwendolen Florence Mary Onslow Countess Iveagh (age 25) were married. She by marriage Countess Iveagh. She the daughter of William Onslow 4th Earl Onslow (age 53) and Florence Coulston Gardner Countess Onslow (age 53). He the son of Edward Guiness 1st Earl Iveagh (age 58) and Adelaide "Dodo" Guinness Countess Iveagh (age 62).
On 15 Oct 1913 Prince Arthur of Connaught (age 30) and Princess Alexandra Duff Duchess Fife (age 22) were married at Chapel Royal, St James's Palace. She the daughter of Alexander Duff 1st Duke Fife and Louise Windsor Duchess Fife (age 46). He the son of Prince Arthur Windsor 1st Duke Connaught and Strathearn (age 63) and Luise Margarete Hohenzollern Duchess Connaught (age 53). They were first cousin once removed. He a grandson of Queen Victoria of the United Kingdom. She a granddaughter of King Edward VII of the United Kingdom.
On 15 Oct 1921 William Bingham Compton 6th Marquess Northampton (age 36) and Emma Margery Thynne Marchioness Northampton (age 28) were married. She by marriage Marchioness Northampton. She the daughter of Thomas Henry Thynne 5th Marquess of Bath (age 59) and Violet Caroline Mordaunt Marchioness Bath (age 52). He the son of William George Spencer Scott Compton 5th Marquess Northampton and Mary Florence Baring Marchioness Northampton. They were second cousin once removed.
On 15 Oct 1921 Geoffrey Russell 4th Baron Ampthill was born to John Russell 3rd Baron Ampthill (age 25) and Christabel Hulme Hart. The biological father remains a mystery since his mother and father had never consummated their marriage. His father apparenbtly never spoke to the child.
On 15 Oct 1925 William Simon Pease 3rd Baron Wardington was born to John William Beaumont Pease 1st Baron Wardington (age 66) and Dorothy Charlotte Forster Baroness Wardington (age 34).
On 15 Oct 1955 John Parker 6th Earl Morley (age 32) and Katherine Molesworth-St Aubyn Countess Morley were married. They were third cousins.
