On 01 May 1762 [his grandfather] William Bentinck 2nd Duke Portland 1709-1762 (age 53) died. His son [his father] William Cavendish-Bentinck 3rd Duke Portland (age 24) succeeded 3rd Duke Portland, 4th Earl of Portland.
On 08 Nov 1766 [his father] William Cavendish-Bentinck 3rd Duke Portland (age 28) and [his mother] Dorothy Cavendish 3rd Duchess Portland 1750-1794 (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 William Henry Cavendish-Scott-Bentinck 4th Duke Portland was born to William Cavendish-Bentinck 3rd Duke Portland (age 30) and Dorothy Cavendish 3rd Duchess Portland 1750-1794 (age 17).
On 03 Jun 1794 [his mother] Dorothy Cavendish 3rd Duchess Portland 1750-1794 (age 43) died.
On 04 Aug 1795 William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 27) and (age 21) were married. She by marriage Duchess Portland. He the son of William Cavendish-Bentinck 3rd Duke Portland (age 57) and Dorothy Cavendish 3rd Duchess Portland 1750-1794.
On 21 Aug 1796 [his son] William Henry Cavendish-Scott-Bentinck was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 28) and [his wife] (age 22).
On 21 Apr 1798 [his daughter] Margaret Harriet Cavendish-Scott-Bentinck was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 29) and [his wife] (age 24).
On 06 Jul 1799 [his daughter] Caroline Cavendish-Scott-Bentinck was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 31) and [his wife] (age 25).
On 17 Sep 1800 [his son] William John Cavendish-Scott-Bentinck 5th Duke Portland 1800-1879 was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 32) and [his wife] (age 26). The date somewhat uncertain according to different sources; Cracroft says 12 Sep 1808 which may be the date he was baptised and 1808 a typo? He was known as John since all the male members of the family were given the first name John.
On 27 Feb 1802 [his son] George Frederick Cavendish-Scott-Bentinck was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 33) and [his wife] (age 28).
On 09 Jun 1804 [his son] Henry William Cavendish-Scott-Bentinck was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 35) and [his wife] (age 30).
On 14 Jan 1806 [his daughter] Charlotte Cavendish-Scott-Bentinck Viscountess Ossington was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 37) and [his wife] (age 32).
On 27 Aug 1807 [his daughter] Lucy Cavendish-Scott-Bentinck was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 39) and [his wife] (age 33).
On 08 Jul 1809 [his daughter] Mary Cavendish-Scott-Bentinck was born to William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 41) and [his wife] (age 35).
On 30 Oct 1809 [his father] William Cavendish-Bentinck 3rd Duke Portland (age 71) died. His son William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 41) succeeded 4th Duke Portland, 5th Earl of Portland.
On 05 Mar 1824 [his son] William Henry Cavendish-Scott-Bentinck (age 27) died.
In 1827 [his son-in-law] Evelyn Denison 1st Viscount Ossington (age 26) and [his daughter] Charlotte Cavendish-Scott-Bentinck Viscountess Ossington (age 20) were married. She the daughter of William Henry Cavendish-Scott-Bentinck 4th Duke Portland 1768-1854 (age 58) and (age 53).
On 22 Jan 1828 [his sister-in-law] Joan Scott Viscountess Canning (age 51) was created 1st Viscount Canning with a special remainder to the heirs male of her late husband George Canning Prime Mininster.
On 23 Jan 1828 [his daughter] Caroline Cavendish-Scott-Bentinck (age 28) died.
On 08 Nov 1828 [his son-in-law] Charles Ellis 6th Baron Walden 2nd Baron Seaford (age 29) and [his daughter] Lucy Cavendish-Scott-Bentinck (age 21) were married at All Souls Church Langham Place Marylebone. She the daughter of William Henry Cavendish-Scott-Bentinck 4th Duke Portland 1768-1854 (age 60) and (age 54).
On 14 Mar 1837 [his sister-in-law] Joan Scott Viscountess Canning (age 60) died. Her son Charles Canning 1st Earl Canning (age 24) succeeded 2nd Viscount Canning.
On 21 Sep 1848 [his son] George Frederick Cavendish-Scott-Bentinck (age 46) died unmarried. He had left his father's home Welbeck Abbey [Map] intending to walk the six miles to Thoresby Hall to dine with Charles Herbert Pierrepont 2nd Earl Manvers (age 70). When he didn't arrive at Thoresby Hall a search party was sent to look for him. They discovered his body at nine in the evening. He was buried in the family vault at St Marylebone Church.
On 27 Mar 1854 William Henry Cavendish-Scott-Bentinck 4th Duke Portland (age 85) died. His son [his son] William John Cavendish-Scott-Bentinck 5th Duke Portland 1800-1879 (age 53) succeeded 5th Duke Portland, 6th Earl of Portland although it took him three years before he took his seat in the House of Lords.
Paternal Family Tree: Bentinck
Maternal Family Tree: Emma de Dinan 1136-1208
Kings Wessex: Great x 22 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 9 Grand Son of King Henry VII of England and Ireland
Kings Scotland: Great x 17 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 12 Grand Son of Charles "Beloved Mad" VI King France
Great x 2 Grandfather: William Bentinck 1st Earl of Portland
Great x 1 Grandfather: Henry Bentinck 1st Duke Portland 1682-1726 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Edward Villiers
Great x 3 Grandfather: Edward Villiers 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Barbara St John 8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Anne Villiers Countess Portland 1651-1688 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Theophilus Howard 2nd Earl Suffolk 8 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Frances Howard 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Home Countess Suffolk 1599-1633 18 x Great Grand Daughter of King Henry I "Beauclerc" England
GrandFather: William Bentinck 2nd Duke Portland 1709-1762 11 x Great Grand Son of Henry IV King England
Great x 4 Grandfather: Baptist Noel 3rd Viscount Campden
Great x 3 Grandfather: Edward Noel 1st Earl Gainsborough
Great x 4 Grandmother: Hester Wotton Viscountess Campden
Great x 2 Grandfather: Wriothesley Baptist Noel 2nd Earl Gainsborough 1661-1690 9 x Great Grand Son of Henry IV King England
Great x 4 Grandfather: Thomas Wriothesley 4th Earl of Southampton 2nd Earl Chichester 7 x Great Grand Son of Henry IV King England
Great x 3 Grandmother: Elizabeth Wriothesley Countess Gainsborough 8 x Great Grand Daughter of Henry IV King England
Great x 4 Grandmother: Elizabeth Leigh Countess Southampton 1620-1655 13 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 1 Grandmother: Elizabeth Noel Duchess Portland 1688-1737 10 x Great Grand Daughter of Henry IV King England
Great x 4 Grandfather: Robert Greville 2nd Baron Brooke 8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Fulke Greville 5th Baron Brooke 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Catherine Russell Baroness Brooke 9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Catherine Greville Duchess Buckingham and Normandby 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Francis Dashwood
Great x 3 Grandmother: Sarah Dashwood Baroness Brooke
Great x 4 Grandmother: Alice Sleigh
Father: William Cavendish-Bentinck 3rd Duke Portland 9 x Great Grand Son of King Edward IV of England
Great x 4 Grandfather: Robert Harley 10 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: Edward Harley 9 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: Robert Harley 1st Earl of Oxford and Earl Mortimer 10 x Great Grand Son of King Edward III of England
Great x 1 Grandfather: Edward Harley 2nd Earl of Oxford and Earl Mortimer 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Thomas Foley
Great x 3 Grandfather: Thomas Foley
Great x 2 Grandmother: Elizabeth Foley Countess of Oxford and Mortimer
GrandMother: Margaret Cavendish Harley 2nd Duchess Portland 1715-1785 8 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandfather: John Holles 2nd Earl de Clare 1595-1666 7 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Gilbert Holles 3rd Earl de Clare 1633-1689 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Vere Countess Clare 8 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 2 Grandfather: John Holles 1st Duke Newcastle upon Tyne 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William Pierrepont of Thoresby 8 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Grace Pierrepont Countess de Clare 1633-1702 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Harries aka Harris
Great x 1 Grandmother: Henrietta Cavendish Holles Countess of Oxford and Mortimer 1694-1755 7 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandfather: William Cavendish 1st Duke Newcastle upon Tyne 4 x Great Grand Son of King Edward IV of England
Great x 3 Grandfather: Henry Cavendish 2nd Duke Newcastle upon Tyne 5 x Great Grand Son of King Edward IV of England
Great x 4 Grandmother: Elizabeth Bassett Countess Newcastle upon Tyne 12 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandmother: Margaret Cavendish Duchess Newcastle upon Tyne 1661-1716 6 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandfather: William Pierrepont of Thoresby 8 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Frances Pierrepont Duchess Newcastle upon Tyne 1630-1695 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Harries aka Harris
William Henry Cavendish-Scott-Bentinck 4th Duke Portland 1768-1854 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: William Cavendish 3rd Earl Devonshire 10 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandfather: William Cavendish 1st Duke Devonshire 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Cecil Countess Devonshire 1619-1689 8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: William Cavendish 2nd Duke Devonshire 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: James Butler 1st Duke Ormonde 9 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Mary Butler Duchess Devonshire 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Preston Duchess Ormonde 9 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: William Cavendish 3rd Duke Devonshire 10 x Great Grand Son of Henry IV King England
Great x 4 Grandfather: William Russell 1st Duke Bedford 9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: William Russell 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Anne Carr Countess of Bedford 9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Rachel Russell Duchess Devonshire 1674-1725 9 x Great Grand Daughter of Henry IV King England
Great x 4 Grandfather: Thomas Wriothesley 4th Earl of Southampton 2nd Earl Chichester 7 x Great Grand Son of Henry IV King England
Great x 3 Grandmother: Rachel Wriothesley 8 x Great Grand Daughter of Henry IV King England
GrandFather: William Cavendish 4th Duke Devonshire 11 x Great Grand Son of Henry IV King England
Mother: 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 2nd Earl Cork 1st Earl Burlington
Great x 3 Grandfather: Charles Boyle 3rd Baron Clifford 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Clifford Countess Burlington 8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Charles Boyle 2nd Earl Burlington 5 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: William Seymour 2nd Duke Somerset 3 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandmother: Jane Seymour Baroness Clifford 4 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Frances Devereux Duchess of Somerset 8 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: Richard Boyle 3rd Earl Burlington 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Baptist Noel 3rd Viscount Campden
Great x 3 Grandfather: Henry Noel
Great x 4 Grandmother: Hester Wotton Viscountess Campden
Great x 2 Grandmother: Juliana Noel Countess Burlington 1672-1750
GrandMother: Charlotte Elizabeth Boyle Marchioness Hartington 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: William Savile 3rd Baronet 8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: George Savile 1st Marquess Halifax 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Anne Coventry Baroness Savile
Great x 2 Grandfather: William Savile 2nd Marquess Halifax 1665-1700 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Henry Spencer 1st Earl of Sunderland 8 x Great Grand Son of Henry IV King England
Great x 3 Grandmother: Dorothy Spencer Lady Savile 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Dorothy Sidney Countess Sunderland 8 x Great Grand Daughter of King Edward III of England
Great x 1 Grandmother: Dorothy Savile Countess Burlington 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Heneage Finch 1st Earl Nottingham 9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Daniel Finch 2nd Earl Nottingham 7th Earl Winchilsea 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Harvey Baroness Finch
Great x 2 Grandmother: Mary Finch Duchess Roxburghe 1677- 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Robert Rich 3rd Earl Warwick 1611-1659 9 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Essex Rich 2nd Countess Nottingham 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Anne Cheeke Countess Warwick 1620-1652 8 x Great Grand Daughter of King Edward III of England