On 16 Jun 1739 [his father] Robert Ker 2nd Duke Roxburghe 1709-1755 (age 30) and [his mother] were married. He the son of John Ker 1st Duke Roxburghe (age 59) and Mary Finch Duchess Roxburghe 1677- (age 62). They were half first cousins.
On 23 Apr 1740 John Ker 3rd Duke Roxburghe was born to Robert Ker 2nd Duke Roxburghe 1709-1755 (age 31) and . Coefficient of inbreeding 3.13%.
On 27 Feb 1741 [his grandfather] John Ker 1st Duke Roxburghe (age 60) died. His son [his father] Robert Ker 2nd Duke Roxburghe 1709-1755 (age 32) succeeded 2nd Duke Roxburghe. [his mother] by marriage Duchess Roxburghe.
On 20 Aug 1755 [his father] Robert Ker 2nd Duke Roxburghe 1709-1755 (age 46) died. His son John Ker 3rd Duke Roxburghe (age 15) succeeded 3rd Duke Roxburghe.
In 1801 John Ker 3rd Duke Roxburghe (age 60) was appointed 623rd Knight of the Garter by King George III of Great Britain and Ireland (age 62)..
In 1804 John Ker 3rd Duke Roxburghe (age 63) died.
Paternal Family Tree: Drummond
Maternal Family Tree: Margaret Hussey 1389-1418
Kings Wessex: Great x 21 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 18 Grand Son of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 24 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 19 Grand Son of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 12 Grand Son of King Edward III of England
Kings Scotland: Great x 14 Grand Son of Robert "The Bruce" I King Scotland
Kings Franks: Great x 18 Grand Son of Louis VII King Franks
Kings France: Great x 14 Grand Son of Philip "The Fair" IV King France
Great x 4 Grandfather: Patrick Drummond 3rd Lord Drummond
Great x 3 Grandfather: John Drummond 2nd Earl Perth 1588-1662
Great x 2 Grandfather: William Ker 2nd Earl Roxburghe 1623-1675 8 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Robert Ker 1st Earl Roxburghe 1570-1650 13 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandmother: Jean Ker Countess Perth 7 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Margaret Maitland 6 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: Robert Ker 3rd Earl Roxburghe 1658-1682 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Robert Ker 1st Earl Roxburghe 1570-1650 13 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: Henry Ker 14 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Jean Drummond Countess Roxburghe 1585-1643
Great x 2 Grandmother: Jane Ker Countess Roxburgh -1675 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: William Hay 10th Earl Erroll 1596-1636 7 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Margaret Hay Countess Cassilis -1695 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Anne Lyon Countess Erroll -1637 8 x Great Grand Daughter of King Edward III of England
GrandFather: John Ker 1st Duke Roxburghe 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: James Hay 12 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: John Hay 1st Earl Tweeddale 13 x Great Grand Son of King John "Lackland" of England
Great x 2 Grandfather: John Hay 1st Marquess Teviotdale 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Alexander Seton 1st Earl Dunfermline 7 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Jean Seton Countess Tweeddale 1606-1625 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Grizel Leslie Countess Dunfermline -1606 7 x Great Grand Daughter of King Edward III of England
Great x 1 Grandmother: Margaret Hay Countess Roxburghe -1753 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Walter "Bold Buccleuch" Scott
Great x 3 Grandfather: 14 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Mary Kerr 13 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandmother: 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Francis Hay 9th Earl Erroll 6 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Mary Hay Countess Buccleuch 7 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Douglas Countess Erroll 12 x Great Grand Daughter of King John "Lackland" of England
Father: Robert Ker 2nd Duke Roxburghe 1709-1755 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Moyle Finch 1st Baronet
Great x 3 Grandfather: Heneage Finch 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Heneage 1st Countess Winchelsea 7 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Heneage Finch 1st Earl Nottingham 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Edmund Bell
Great x 3 Grandmother: Frances Bell 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Muriel Knyvet 7 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: Daniel Finch 2nd Earl Nottingham 7th Earl Winchilsea 10 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Daniel Harvey
Great x 2 Grandmother: Elizabeth Harvey Baroness Finch
GrandMother: Mary Finch Duchess Roxburghe 1677- 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Robert Rich 1st Earl Warwick
Great x 3 Grandfather: Robert Rich 2nd Earl Warwick 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Penelope Devereux Countess Devonshire 7 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Robert Rich 3rd Earl Warwick 1611-1659 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William Newport aka Hatton
Great x 3 Grandmother: Frances Hatton Countess Warwick
Great x 4 Grandmother: Elizabeth Gawdy
Great x 1 Grandmother: Essex Rich 2nd Countess Nottingham 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Henry Cheeke
Great x 3 Grandfather: Thomas Cheeke 7 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Frances Radclyffe 6 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Anne Cheeke Countess Warwick 1620-1652 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Robert Rich 1st Earl Warwick
Great x 3 Grandmother: Essex Rich 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Penelope Devereux Countess Devonshire 7 x Great Grand Daughter of King Edward III of England
John Ker 3rd Duke Roxburghe 1740-1804 12 x Great Grand Son of King Edward III of England
GrandFather: Roger Mostyn
Mother: 12 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Moyle Finch 1st Baronet
Great x 3 Grandfather: Heneage Finch 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Heneage 1st Countess Winchelsea 7 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Heneage Finch 1st Earl Nottingham 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Edmund Bell
Great x 3 Grandmother: Frances Bell 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Muriel Knyvet 7 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: Daniel Finch 2nd Earl Nottingham 7th Earl Winchilsea 10 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Daniel Harvey
Great x 2 Grandmother: Elizabeth Harvey Baroness Finch
GrandMother: Essex Finch 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Christopher Hatton of Clay Hall in Essex
Great x 3 Grandfather: Christopher Hatton 1st Baron Hatton 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Alice Fanshawe 7 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Christopher Hatton 1st Viscount Hatton 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Charles Montagu 9 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandmother: Elizabeth Montagu Baroness Hatton 10 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandmother: Mary Whitmore
Great x 1 Grandmother: Anne Hatton Countess Nottingham and Winchelsea -1743 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Nicholas Tufton 1st Earl of Thanet 7 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: John Tufton 2nd Earl of Thanet 1608-1664 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Frances Cecil Countess Isle Thanet 7 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Cicely Tufton Viscountess Hatton 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Richard Sackville 3rd Earl Dorset 8 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Margaret Sackville Countess Isle Thanet 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Anne Clifford Countess Dorset and Pembroke 7 x Great Grand Daughter of King Edward III of England