Before 1748 [her father] William Cavendish 4th Duke Devonshire (age 27) and [her mother] Charlotte Elizabeth Boyle Marchioness Hartington (age 16) were married. She the daughter of Richard Boyle 3rd Earl Burlington (age 53) and Dorothy Savile Countess Burlington (age 48). He the son of William Cavendish 3rd Duke Devonshire (age 49) and (age 49).
On 27 Aug 1750 Dorothy Cavendish 3rd Duchess Portland was born to William Cavendish 4th Duke Devonshire (age 30) and Charlotte Elizabeth Boyle Marchioness Hartington (age 18).
On 04 Dec 1753 [her grandfather] Richard Boyle 3rd Earl Burlington (age 59) died. Earl Burlington extinct. His daughter [her mother] Charlotte Elizabeth Boyle Marchioness Hartington (age 22) succeeded 6th Baroness Clifford.
On 08 Dec 1754 [her mother] Charlotte Elizabeth Boyle Marchioness Hartington (age 23) died. Her son [her brother] William Cavendish 5th Duke Devonshire (age 6) succeeded 7th Baron Clifford.
On 05 Dec 1755 [her grandfather] William Cavendish 3rd Duke Devonshire (age 57) died. His son [her father] William Cavendish 4th Duke Devonshire (age 35) succeeded 4th Duke Devonshire, 7th Earl Devonshire.
On 01 May 1762 William Bentinck 2nd Duke Portland 1709-1762 (age 53) died. His son [her future husband] William Cavendish-Bentinck 3rd Duke Portland (age 24) succeeded 3rd Duke Portland, 4th Earl of Portland.
On 02 Oct 1764 [her father] William Cavendish 4th Duke Devonshire (age 44) died. His son [her brother] William Cavendish 5th Duke Devonshire (age 16) succeeded 5th Duke Devonshire, 8th Earl Devonshire.
On 08 Nov 1766 William Cavendish-Bentinck 3rd Duke Portland (age 28) and Dorothy Cavendish 3rd Duchess Portland (age 16) were married. She by marriage Duchess Portland. She the daughter of William Cavendish 4th Duke Devonshire and Charlotte Elizabeth Boyle Marchioness Hartington. He the son of William Bentinck 2nd Duke Portland 1709-1762 and Margaret Cavendish Harley 2nd Duchess Portland 1715-1785 (age 51). They were half fourth cousins.
On 23 Jun 1768 [her son] William Henry Cavendish-Scott-Bentinck 4th Duke Portland 1768-1854 was born to [her husband] William Cavendish-Bentinck 3rd Duke Portland (age 30) and Dorothy Cavendish 3rd Duchess Portland (age 17).
On 14 Sep 1774 [her son] William Henry Cavendish-Bentinck was born to [her husband] William Cavendish-Bentinck 3rd Duke Portland (age 36) and Dorothy Cavendish 3rd Duchess Portland (age 24).
On 03 Oct 1775 [her daughter] Charlotte Cavendish-Bentinck was born to [her husband] William Cavendish-Bentinck 3rd Duke Portland (age 37) and Dorothy Cavendish 3rd Duchess Portland (age 25).
On 13 Mar 1779 [her daughter] Mary Cavendish-Bentinck was born to [her husband] William Cavendish-Bentinck 3rd Duke Portland (age 40) and Dorothy Cavendish 3rd Duchess Portland (age 28).
On 03 Oct 1780 [her son] Charles Cavendish-Bentinck was born to [her husband] William Cavendish-Bentinck 3rd Duke Portland (age 42) and Dorothy Cavendish 3rd Duchess Portland (age 30).
On 02 Nov 1781 [her son] Frederick Cavendish-Bentinck was born to [her husband] William Cavendish-Bentinck 3rd Duke Portland (age 43) and Dorothy Cavendish 3rd Duchess Portland (age 31).
On 03 Jun 1794 Dorothy Cavendish 3rd Duchess Portland (age 43) died.
On 30 Oct 1809 [her former husband] William Cavendish-Bentinck 3rd Duke Portland (age 71) died. His son [her son] William Henry Cavendish-Scott-Bentinck 4th Duke Portland 1768-1854 (age 41) succeeded 4th Duke Portland, 5th Earl of Portland.
Paternal Family Tree: Cavendish
Maternal Family Tree: Emma de Dinan 1136-1208
Kings Wessex: Great x 22 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 18 Grand Daughter of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 23 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 19 Grand Daughter of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 8 Grand Daughter of King Henry VII of England and Ireland
Kings Scotland: Great x 16 Grand Daughter of Robert "The Bruce" I King Scotland
Kings Franks: Great x 18 Grand Daughter of Louis VII King Franks
Kings France: Great x 11 Grand Daughter of Charles "Beloved Mad" VI King France
Great x 4 Grandfather: William Cavendish 2nd Earl Devonshire 9 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandfather: William Cavendish 3rd Earl Devonshire 10 x Great Grand Son of King Edward "Longshanks" I of England
Great x 4 Grandmother: Christian Bruce Countess Devonshire
Great x 2 Grandfather: William Cavendish 1st Duke Devonshire 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William Cecil 2nd Earl Salisbury
7 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Elizabeth Cecil Countess Devonshire 1619-1689 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Catherine Howard Countess Salisbury
7 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: William Cavendish 2nd Duke Devonshire 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Thomas Butler Viscount Thurles
10 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandfather: James Butler 1st Duke Ormonde 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Poyntz
8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Mary Butler Duchess Devonshire 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Richard Preston 1st Earl Desmond
Great x 3 Grandmother: Elizabeth Preston Duchess Ormonde 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Butler 8 x Great Grand Daughter of King Edward III of England
GrandFather: William Cavendish 3rd Duke Devonshire 10 x Great Grand Son of Henry IV King England
Great x 4 Grandfather: Francis Russell 4th Earl Bedford
10 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: William Russell 1st Duke Bedford 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Catherine Brydges Countess Bedford 8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: William Russell 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Robert Carr 1st Earl Somerset
13 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandmother: Anne Carr Countess of Bedford 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Frances Howard Countess Essex and Somerset 8 x Great Grand Daughter of King Edward III of England
Great x 1 Grandmother: Rachel Russell Duchess Devonshire 1674-1725 9 x Great Grand Daughter of Henry IV King England
Great x 4 Grandfather: Henry Wriothesley 3rd Earl of Southampton
7 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Thomas Wriothesley 4th Earl of Southampton 2nd Earl Chichester 7 x Great Grand Son of Henry IV King England
Great x 4 Grandmother: Elizabeth Vernon Countess Southampton 1572-1655
6 x Great Grand Daughter of Henry IV King England
Great x 2 Grandmother: Rachel Wriothesley 8 x Great Grand Daughter of Henry IV King England
Father: William Cavendish 4th Duke Devonshire 11 x Great Grand Son of Henry IV King England
Dorothy Cavendish 3rd Duchess Portland 1750-1794 8 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Richard Boyle 1st Earl Cork
Great x 3 Grandfather: Richard Boyle 2nd Earl Cork 1st Earl Burlington
Great x 2 Grandfather: Charles Boyle 3rd Baron Clifford 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Henry Clifford 5th Earl of Cumberland
7 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Elizabeth Clifford Countess Burlington 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Frances Cecil Countess Cumberland 1593-1644 7 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: Charles Boyle 2nd Earl Burlington 5 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Edward Seymour
2 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: William Seymour 2nd Duke Somerset 3 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Honora Rogers
Great x 2 Grandmother: Jane Seymour Baroness Clifford 4 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Robert Devereux 2nd Earl Essex 7 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Frances Devereux Duchess of Somerset
8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Frances Walsingham Countess Essex 9 x Great Grand Daughter of King Edward "Longshanks" I of England
GrandFather: Richard Boyle 3rd Earl Burlington 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Edward Noel 2nd Viscount Campden
Great x 3 Grandfather: Baptist Noel 3rd Viscount Campden
Great x 4 Grandmother: Juliana Hicks Viscountess Campden
Great x 2 Grandfather: Henry Noel
Great x 4 Grandfather: Thomas Wotton 2nd Baron Wotton
Great x 3 Grandmother: Hester Wotton Viscountess Campden
Great x 1 Grandmother: Juliana Noel Countess Burlington 1672-1750
Mother: Charlotte Elizabeth Boyle Marchioness Hartington 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: George Savile
7 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: William Savile 3rd Baronet 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Anne Wentworth
12 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 2 Grandfather: George Savile 1st Marquess Halifax 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Thomas Coventry 1st Baron Coventry
Great x 3 Grandmother: Anne Coventry Baroness Savile
Great x 4 Grandmother: Elizabeth Aldersley Baroness Coventry
Great x 1 Grandfather: William Savile 2nd Marquess Halifax 1665-1700 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William Spencer 2nd Baron Spencer
8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Henry Spencer 1st Earl of Sunderland 8 x Great Grand Son of Henry IV King England
Great x 4 Grandmother: Penelope Wriothesley Baroness Spencer Wormleighton 7 x Great Grand Daughter of Henry IV King England
Great x 2 Grandmother: Dorothy Spencer Lady Savile 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Robert Sidney 2nd Earl of Leicester
10 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandmother: Dorothy Sidney Countess Sunderland 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Dorothy Percy Countess Leicester 1598-1659
7 x Great Grand Daughter of King Edward III of England
GrandMother: Dorothy Savile Countess Burlington 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Heneage Finch
8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Heneage Finch 1st Earl Nottingham 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Frances Bell 8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Daniel Finch 2nd Earl Nottingham 7th Earl Winchilsea 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Daniel Harvey
Great x 3 Grandmother: Elizabeth Harvey Baroness Finch
Great x 1 Grandmother: Mary Finch Duchess Roxburghe 1677- 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Robert Rich 2nd Earl Warwick
8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Robert Rich 3rd Earl Warwick 1611-1659 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Frances Hatton Countess Warwick
Great x 2 Grandmother: Essex Rich 2nd Countess Nottingham 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Thomas Cheeke 7 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Anne Cheeke Countess Warwick 1620-1652 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Essex Rich 8 x Great Grand Daughter of King Edward III of England