In Mar 1734 [his father] Augustus Fitzroy (age 17) and [his mother] Elizabeth Cosby (age 13) were married. He the son of Charles Fitzroy 2nd Duke Grafton (age 50) and Henrietta Somerset Duchess Grafton. He a great grandson of King Charles II of England Scotland and Ireland.

On 29 Jan 1756 Augustus Henry Fitzroy 3rd Duke Grafton (age 20) and Anne Liddell Duchess Grafton (age 19) were married. He a great x 2 grandson of King Charles II of England Scotland and Ireland.

On 23 Mar 1769 Augustus Henry Fitzroy 3rd Duke Grafton (age 33) and Anne Liddell Duchess Grafton (age 32) were divorced when he discovered she was pregnant by her lover John Fitzpatrick 2nd Earl Upper Ossory (age 23) whom she subsequently married. Plans to marry his mistress Anne aka Nancy Parsons Viscountess Maynard (age 34), if they existed, were undermined by the the discovery he discovered she was having an affair with John Frederick Sackville 3rd Duke Dorset (age 23).

After 23 Mar 1769 John Fitzpatrick 2nd Earl Upper Ossory (age 23) and [his former wife] Anne Liddell Duchess Grafton (age 32) were married. She by marriage Countess Upper Ossory. He the son of John Fitzpatrick 1st Earl Upper Ossory and Evelyn Leveson-Gower Countess Upper Ossory.

On 24 Jun 1769, three months after his divorce from his first wife Anne Liddell Duchess Grafton (age 32), Augustus Henry Fitzroy 3rd Duke Grafton (age 33) and Elizabeth Wrottesley Duchess Grafton (age 23) were married. She by marriage Duchess Grafton. He a great x 2 grandson of King Charles II of England Scotland and Ireland.

In 1770 [his brother-in-law] John Wrottesley 8th Baronet (age 25) and Frances Courtenay Lady Wrottesley were married. She by marriage Lady Wrottesley of Wrottesley in Staffordshire. She the daughter of William Courtenay 7th Earl Devon and Frances Finch Countess Devon.

After 12 Dec 1773 [his son-in-law] William Fitzroy and [his daughter] 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 04 Jun 1778 [his son-in-law] John Smyth (age 30) and [his daughter] Georgiana Fitzroy (age 21) were married. She the daughter of Augustus Henry Fitzroy 3rd Duke Grafton (age 42) and Anne Liddell Duchess Grafton (age 41). She a great x 3 granddaughter of King Charles II of England Scotland and Ireland.

On 16 Nov 1784 [his son] George Henry Fitzroy 4th Duke Grafton (age 24) and [his daughter-in-law] Charlotte Maria Waldegrave (age 23) were married at Navestock. She the daughter of James Waldegrave 2nd Earl Waldegrave and Maria Walpole Duchess Gloucester and Edinburgh (age 48). He the son of Augustus Henry Fitzroy 3rd Duke Grafton (age 49) and Anne Liddell Duchess Grafton (age 47). He a great x 3 grandson of King Charles II of England Scotland and Ireland. She a great x 2 granddaughter of King James II of England Scotland and Ireland.

On 20 Jun 1795 [his son] Charles Fitzroy (age 30) and [his daughter-in-law] Frances Mundy were married. He the son of Augustus Henry Fitzroy 3rd Duke Grafton (age 59) and Anne Liddell Duchess Grafton (age 58). He a great x 3 grandson of King Charles II of England Scotland and Ireland.

On 10 Sep 1800 [his son] Henry Fitzroy (age 30) and [his daughter-in-law] Caroline Pigot (age 25) were married. He the son of Augustus Henry Fitzroy 3rd Duke Grafton (age 64) and Elizabeth Wrottesley Duchess Grafton (age 54). He a great x 3 grandson of King Charles II of England Scotland and Ireland.

On 25 Nov 1800 [his son-in-law] Francis Almeric Spencer 1st Baron Churchill (age 20) and [his daughter] Frances Fitzroy Baroness Churchill Wychwood (age 20) were married. She the daughter of Augustus Henry Fitzroy 3rd Duke Grafton (age 65) and Elizabeth Wrottesley Duchess Grafton (age 55). He the son of George Spencer 4th Duke Marlborough (age 61) and Caroline Russell Duchess Marlborough (age 57). They were second cousins. She a great x 3 granddaughter of King Charles II of England Scotland and Ireland.

Before 09 Feb 1810 [his son] Charles Fitzroy (age 45) and [his daughter-in-law] Frances Stewart (age 32) were married. She the daughter of Robert Stewart 1st Marquess Londonderry (age 70) and Frances Pratt Marchioness Londonderry (age 59). He the son of Augustus Henry Fitzroy 3rd Duke Grafton (age 74) and Anne Liddell Duchess Grafton. He a great x 3 grandson of King Charles II of England Scotland and Ireland.