On 08 Jun 1775 [his father] Algernon Percy 1st Earl Beverley (age 25) and [his mother] Isabella Susan Burrell Countess Beverley 1750-1812 (age 24) were married at Syon House [Map]. He the son of Hugh Percy 1st Duke Northumberland (age 59) and Elizabeth Seymour Duchess Northumberland (age 58).
On 22 Jun 1778 George Percy 5th Duke Northumberland was born to Algernon Percy 1st Earl Beverley (age 28) and Isabella Susan Burrell Countess Beverley 1750-1812 (age 27).
In 1790 [his father] Algernon Percy 1st Earl Beverley (age 39) was created 1st Earl Beverley. [his mother] Isabella Susan Burrell Countess Beverley 1750-1812 (age 39) by marriage Countess Beverley.
On 30 Mar 1799 [his future brother-in-law] James Archibald Stuart-Wortley-Mackenzie 1st Baron Wharncliffe (age 22) and Elizabeth Caroline Mary Crichton Baroness Wharncliffe were married. She the daughter of (age 68) and Mary Caroline Hervey Countess Erne 1753-1842 (age 46).
On 22 Jun 1801 George Percy 5th Duke Northumberland (age 23) and Louisa Harcourt Stuart-Wortley-Mackenzie (age 19) were married. He the son of Algernon Percy 1st Earl Beverley (age 51) and Isabella Susan Burrell Countess Beverley 1750-1812 (age 50).
In 1802 [his daughter] Louisa Percy was born to George Percy 5th Duke Northumberland (age 23) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 20).
In 1803 [his son] Algernon James Percy was born to George Percy 5th Duke Northumberland (age 24) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 21).
In 1805 [his daughter] Margaret Percy was born to George Percy 5th Duke Northumberland (age 26) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 23).
In 1805 [his son] Algernon James Percy (age 2) died. He was buried at Northumberland Vault, Crypt, Westminster Abbey.
In 1806 [his son] Henry Algernon Pitt Percy was born to George Percy 5th Duke Northumberland (age 27) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 24).
In 1809 [his son] Henry Algernon Pitt Percy (age 3) died. He was buried at Northumberland Vault, Crypt, Westminster Abbey.
In 1809 [his daughter] Alice Percy was born to George Percy 5th Duke Northumberland (age 30) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 27).
In 1810 [his daughter] Margaret Percy (age 5) died. She was buried at Northumberland Vault, Crypt, Westminster Abbey.
On 20 May 1810 [his son] Algernon George Percy 6th Duke Northumberland 1810-1899 was born to George Percy 5th Duke Northumberland (age 31) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 28).
In 1811 [his son] Josceline William Percy was born to George Percy 5th Duke Northumberland (age 32) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 29).
On 24 Jan 1812 [his mother] Isabella Susan Burrell Countess Beverley 1750-1812 (age 61) died. She was buried in the Northumberland Vault, Crypt, Westminster Abbey.
In 1813 [his brother-in-law] George Stuart-Wortley (age 30) died.
In 1813 [his daughter] Margaret Percy Baroness Hatherton was born to George Percy 5th Duke Northumberland (age 34) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 31).
On 22 Aug 1817 [his son] Henry Hugh Manvers Percy was born to George Percy 5th Duke Northumberland (age 39) and [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 35) at Burwood House, Cobham. He was educated at Eton College [Map].
In 1819 [his daughter] Alice Percy (age 10) died.
In 1826 [his brother-in-law] James Archibald Stuart-Wortley-Mackenzie 1st Baron Wharncliffe (age 49) was created 1st Baron Wharncliffe of Wortley in Yorkshire. Elizabeth Caroline Mary Crichton Baroness Wharncliffe by marriage Baroness Wharncliffe of Wortley in Yorkshire.
On 21 Oct 1830 [his father] Algernon Percy 1st Earl Beverley (age 80) died. His son George Percy 5th Duke Northumberland (age 52) succeeded 2nd Earl Beverley.
In 1841 [his son-in-law] Edward Richard Littleton 2nd Baron Hatherton (age 25) and [his daughter] Margaret Percy Baroness Hatherton (age 28) were married. She the daughter of George Percy 5th Duke Northumberland 1778-1867 (age 62) and Louisa Harcourt Stuart-Wortley-Mackenzie (age 59).
In 1845 [his son] Algernon George Percy 6th Duke Northumberland 1810-1899 (age 34) and [his daughter-in-law] were married. He the son of George Percy 5th Duke Northumberland 1778-1867 (age 66) and Louisa Harcourt Stuart-Wortley-Mackenzie (age 63).
On 19 Dec 1845 [his brother-in-law] James Archibald Stuart-Wortley-Mackenzie 1st Baron Wharncliffe (age 69) died. His son John Stuart-Wortley-Mackenzie 2nd Baron Wharncliffe (age 44) succeeded 2nd Baron Wharncliffe of Wortley in Yorkshire. Georgiana Elizabeth Ryder Baroness Wharncliffe (age 41) by marriage Baroness Wharncliffe of Wortley in Yorkshire.
On 31 Jan 1848 [his wife] Louisa Harcourt Stuart-Wortley-Mackenzie (age 66) died.
On 09 Mar 1855 [his former sister-in-law] Mary Stuart-Wortley-Mackenzie died.
On 12 Feb 1865 Algernon Percy 4th Duke Northumberland (age 72) died without issue. His first cousin George Percy 5th Duke Northumberland (age 86) succeeded 5th Duke Northumberland, 8th Baronet Smithson of Stanwick in Yorkshire. His great nephew John Murray aka Stewart-Murray 7th Duke of Atholl 1840-1917 (age 24) succeeded 6th Baron Percy.
On 22 Aug 1867 George Percy 5th Duke Northumberland (age 89) died. His son [his son] Algernon George Percy 6th Duke Northumberland 1810-1899 (age 57) succeeded 6th Duke Northumberland, 3rd Earl Beverley, 9th Baronet Smithson of Stanwick in Yorkshire. [his daughter-in-law] by marriage Duchess Northumberland.
Paternal Family Tree: Smithson
Maternal Family Tree: Elizabeth Lewis
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 25 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 9 Grand Son of King Henry VII of England and Ireland
Kings Scotland: Great x 18 Grand Son of William "Lion" I King Scotland
Kings Franks: Great x 19 Grand Son of Louis VII King Franks
Kings France: Great x 12 Grand Son of Charles "Beloved Mad" VI King France
Great x 4 Grandfather: Hugh Smithson 1st Baronet
Great x 3 Grandfather: Jerome Smithson 2nd Baronet
Great x 2 Grandfather: Hugh Smithson 3rd Baronet
Great x 1 Grandfather: Langdale Smithson
GrandFather: Hugh Percy 1st Duke Northumberland
Father: Algernon Percy 1st Earl Beverley 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Francis Seymour 1st Baron Seymour Trowbridge 3 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: Charles Seymour 2nd Baron Seymour Trowbridge 4 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Frances Prynne 7 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Charles Seymour 6th Duke Somerset 5 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: William Alington 1st Baron Alington 12 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandmother: Eizabeth Alington 2nd Baroness Seymour Trowbridge 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Tollemache Baroness Alington
7 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: Algernon Seymour 7th Duke Somerset 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Algernon Percy 10th Earl of Northumberland 7 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Josceline Percy 11th Earl of Northumberland 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Howard Countess Northumberland
9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Elizabeth Percy Duchess Somerset 9 x Great Grand Daughter of King Edward III of 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 Northumberland 1646-1690 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
GrandMother: Elizabeth Seymour Duchess Northumberland 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Henry Thynne 1st Baronet
9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Thomas Thynne 1st Viscount Weymouth 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Mary Coventry Lady Thynne Kempsford
Great x 2 Grandfather: Henry Thynne 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Heneage Finch 3rd Earl Winchilsea
8 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Frances Finch Viscountess Weymouth 5 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Mary Seymour Countess Winchelsea 1637-1673 4 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 1 Grandmother: Frances Thynne Duchess Somerset 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: John Strode of Parnham
8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: George Strode 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Anne Wyndham 10 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 2 Grandmother: Grace Strode 10 x Great Grand Daughter of King Edward III of England
George Percy 5th Duke Northumberland 1778-1867 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 1 Grandfather: Peter Burrell
GrandFather: Peter Burrell
Great x 3 Grandfather: John Raymond
Great x 2 Grandfather: Hugh Raymond
Great x 1 Grandmother: Amy Raymond
Mother: Isabella Susan Burrell Countess Beverley 1750-1812
Great x 1 Grandfather: John Lewis 
GrandMother: Elizabeth Lewis