On 12 Oct 1847 [his father] Charles William Fitzgerald Fitzgerald 4th Duke Leinster 1819-1887 (age 28) and [his mother] Caroline Leveson-Gower Duchess Leinster 1827-1887 (age 20) were married at Trentham, Staffordshire. She the daughter of George Sutherland Leveson-Gower 2nd Duke Sutherland (age 61) and Harriet Elizabeth Georgiana Howard Duchess Sutherland (age 41). He the son of Augustus Fitzgerald 3rd Duke Leinster 1791-1874 (age 56) and Charlotte Augusta Stanhope Duchess Leinster 1793-1859 (age 54). He a great x 4 grandson of King Charles II of England Scotland and Ireland. 
On 16 Aug 1851 Gerald Fitzgerald 5th Duke Leinster was born to Charles William Fitzgerald Fitzgerald 4th Duke Leinster 1819-1887 (age 32) and Caroline Leveson-Gower Duchess Leinster 1827-1887 (age 24) at Dublin [Map].
On 10 Feb 1874 [his grandfather] Augustus Fitzgerald 3rd Duke Leinster 1791-1874 (age 82) died. His son [his father] Charles William Fitzgerald Fitzgerald 4th Duke Leinster 1819-1887 (age 54) succeeded 4th Duke Leinster. [his mother] Caroline Leveson-Gower Duchess Leinster 1827-1887 (age 46) by marriage Duchess Leinster.
On 17 Jan 1884 Gerald Fitzgerald 5th Duke Leinster (age 32) and Hermione Wilhelmina Duncombe Duchess Leinster 1864-1895 (age 19) were married. She the daughter of William Duncombe 1st Earl Feversham (age 54) and Mabel Violet Graham Countess Feversham (age 50). He the son of Charles William Fitzgerald Fitzgerald 4th Duke Leinster 1819-1887 (age 64) and Caroline Leveson-Gower Duchess Leinster 1827-1887 (age 56). He a great x 5 grandson of King Charles II of England Scotland and Ireland. 
On 10 Jan 1886 [his brother-in-law] James Henry Duncombe (age 32) died.
On 10 Feb 1887, coincidentally the same day his father died, 10 February, [his father] Charles William Fitzgerald Fitzgerald 4th Duke Leinster 1819-1887 (age 67) died at Carton House, Carton, Kildare, County Kildare. His son Gerald Fitzgerald 5th Duke Leinster (age 35) succeeded 5th Duke Leinster. [his wife] Hermione Wilhelmina Duncombe Duchess Leinster 1864-1895 (age 22) by marriage Duchess Leinster.
On 01 Mar 1887 [his son] Maurice Fitzgerald 6th Duke Leinster 1887-1922 was born to Gerald Fitzgerald 5th Duke Leinster (age 35) and [his wife] Hermione Wilhelmina Duncombe Duchess Leinster 1864-1895 (age 22) at Kilkea Castle, Castledermot, County Kildare.
On 13 May 1887 [his mother] Caroline Leveson-Gower Duchess Leinster 1827-1887 (age 60) died.
On 21 Sep 1888 [his son] Desmond Fitzgerald was born to Gerald Fitzgerald 5th Duke Leinster (age 37) and [his wife] Hermione Wilhelmina Duncombe Duchess Leinster 1864-1895 (age 24).
In 1890 Edgar Vincent 1st Viscount D'Abernon (age 32) and [his sister-in-law] Helen Venetia Duncombe Viscountess D'Abernon (age 24) were married. She the daughter of William Duncombe 1st Earl Feversham (age 60) and Mabel Violet Graham Countess Feversham (age 56).
On 06 May 1892 [his son] Edward Fitzgerald 7th Duke Leinster 1892-1976 was born to Gerald Fitzgerald 5th Duke Leinster (age 40) and [his wife] Hermione Wilhelmina Duncombe Duchess Leinster 1864-1895 (age 28). His biological father was suspected to be Hugo Charteris 11th Earl Wemyss (age 34) with whom his mother was believed to have been having an affair at the time.
On 01 Dec 1893 Gerald Fitzgerald 5th Duke Leinster (age 42) died of typhoid. His son [his son] Maurice Fitzgerald 6th Duke Leinster 1887-1922 (age 6) succeeded 6th Duke Leinster.
On 19 Mar 1895 [his former wife] Hermione Wilhelmina Duncombe Duchess Leinster 1864-1895 (age 30) died of tuberculosis at Menton.
Paternal Family Tree: Fitzgerald
Maternal Family Tree: Anna Maria Mordaunt 1771
Descendants Family Trees:
Kings Wessex: Great x 22 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 19 Grand Son of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 23 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 20 Grand Son of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 5 Grand Son of King Charles II of England Scotland and Ireland
Kings Scotland: Great x 17 Grand Son of Robert "The Bruce" I King Scotland
Kings Franks: Great x 19 Grand Son of Louis VII King Franks
Kings France: Great x 7 Grand Son of Henry IV King France
Great x 4 Grandfather: Robert Fitzgerald 7 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Robert Fitzgerald 19th Earl of Kildare 1675-1743 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Mary Clotworthy
Great x 2 Grandfather: James Fitzgerald 1st Duke Leinster 1722-1773 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William O'Brien 3rd Earl Inchiquin 1662-1719 11 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Mary O'Brien Countess Kildare -1730 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Mary Villiers Countess Inchiquin -1753
10 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: William Robert Fitzgerald 2nd Duke Leinster 1749-1804 2 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Charles Lennox 1st Duke Richmond
Son of King Charles II of England Scotland and Ireland
Great x 3 Grandfather: Charles Lennox 2nd Duke Richmond Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandmother: Anne Brudenell Duchess Richmond
9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Emilia Mary Lennox Duchess Leinster 1731-1814 Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: William Cadogan 1st Earl Cadogan
Great x 3 Grandmother: Sarah Cadogan Duchess Richmond 1705-1751
GrandFather: Augustus Fitzgerald 3rd Duke Leinster 1791-1874 3 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 3 Grandfather: John Ussher
Great x 2 Grandfather: St George Ussher aka St George 1st Baron Saint George
Great x 4 Grandfather: George St George 1st Baron St George
Great x 3 Grandmother: Mary St George
Great x 4 Grandmother: Margaret Skeffington Lady St George
Father: Charles William Fitzgerald Fitzgerald 4th Duke Leinster 1819-1887 4 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: John Stanhope 8 x Great Grand Son of Henry IV King England
Great x 3 Grandfather: William Stanhope 1st Earl of Harrington 1683-1756 9 x Great Grand Son of Henry IV King England
Great x 2 Grandfather: William Stanhope 2nd Earl of Harrington 1719-1779 10 x Great Grand Son of Henry IV King England
Great x 1 Grandfather: Charles Stanhope 3rd Earl of Harrington 1753-1829 2 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Henry Fitzroy 1st Duke Grafton Son of King Charles II of England Scotland and Ireland
Great x 3 Grandfather: Charles Fitzroy 2nd Duke Grafton
Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandmother: Isabella Bennet Duchess Grafton 11 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Caroline Fitzroy Countess Harrington Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Charles Somerset Marquess Worcester
10 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Henrietta Somerset Duchess Grafton 1690-1726 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Rebecca Child Marchioness Worcester
GrandMother: Charlotte Augusta Stanhope Duchess Leinster 1793-1859 3 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 2 Grandfather: John Fleming 1st Baronet
Great x 1 Grandmother: Jane Fleming Countess Harrington
Gerald Fitzgerald 5th Duke Leinster 1851-1893 5 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: John Leveson-Gower 1st Baron Gower
Great x 3 Grandfather: John Leveson-Gower 1st Earl Gower 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Catherine Manners Baroness Gower
9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Granville Leveson-Gower 1st Marquess Stafford 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Evelyn Pierrepont 1st Duke Kingston upon Hull
10 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Evelyn Pierrepont Baroness Gower 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Mary Fielding Countess Kingston upon Hull 1668-1697
8 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: George Granville Leveson-Gower 1st Duke Sutherland 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: John Egerton 3rd Earl Bridgewater 1646-1701
5 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: Scroop Egerton 1st Duke Bridgewater 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Jane Paulet Countess Bridgewater 1656-1716
9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Louisa Egerton Countess Gower 1723-1761 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Wriothesley Russell 2nd Duke Bedford 1680-1711
9 x Great Grand Son of Henry IV King England
Great x 3 Grandmother: Rachel Russell Duchess Bridgewater 10 x Great Grand Daughter of Henry IV King England
GrandFather: George Sutherland Leveson-Gower 2nd Duke Sutherland 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: William Gordon aka Sutherland 7 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: William Sutherland 17th Earl Sutherland 1708-1750 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 2 Grandfather: William Sutherland 18th Earl Sutherland 1735-1766 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: David Wemyss 4th Earl Wemyss 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandmother: Elizabeth Wemyss Countess Sutherland 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Elizabeth St Clair
Great x 1 Grandmother: Elizabeth Sutherland Duchess Sutherland 19th Countess Sutherland 9 x Great Grand Daughter of King Henry VII of England and Ireland
Mother: Caroline Leveson-Gower Duchess Leinster 1827-1887 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Charles Howard 3rd Earl Carlisle 1669-1738 9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Henry Howard 4th Earl Carlisle 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Anne Capell Countess Carlisle 9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Frederick Howard 5th Earl Carlisle 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William Byron 4th Baron Byron
14 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandmother: Isabella Byron Countess Carlisle 1721-1795 12 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandmother: Frances Berkeley Baroness Byron
11 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 1 Grandfather: George Howard 6th Earl Carlisle 1773-1848 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: John Leveson-Gower 1st Earl Gower 10 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Granville Leveson-Gower 1st Marquess Stafford 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Evelyn Pierrepont Baroness Gower 9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Margaret Caroline Leveson-Gower Countess Carlisle -1824 8 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Scroop Egerton 1st Duke Bridgewater 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandmother: Louisa Egerton Countess Gower 1723-1761 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Rachel Russell Duchess Bridgewater 10 x Great Grand Daughter of Henry IV King England
GrandMother: Harriet Elizabeth Georgiana Howard Duchess Sutherland 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: William Cavendish 3rd Duke Devonshire
10 x Great Grand Son of Henry IV King England
Great x 3 Grandfather: William Cavendish 4th Duke Devonshire 11 x Great Grand Son of Henry IV King England
Great x 2 Grandfather: William Cavendish 5th Duke Devonshire 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Richard Boyle 3rd Earl Burlington
6 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandmother: Charlotte Elizabeth Boyle Marchioness Hartington 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Dorothy Savile Countess Burlington
11 x Great Grand Daughter of King Edward III of England
Great x 1 Grandmother: Georgiana Cavendish Countess Carlisle 1783-1858 9 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: John Spencer
11 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: John Spencer 1st Earl Spencer 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Georgiana Caroline Carteret 1716-1780
8 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 2 Grandmother: Georgiana Spencer Duchess Devonshire 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Stephen Poyntz
13 x Great Grand Son of King Henry III of England
Great x 3 Grandmother: Margaret Georgiana Poyntz Countess Spencer 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Anna Maria Mordaunt
10 x Great Grand Daughter of King Edward III of England