On 16 Nov 1956 Ralph Percy 12th Duke of Northumberland was born to Hugh Algernon Percy 10th Duke Northumberland 1914-1988 (age 42) and Elizabeth Diana Montagu-Douglas-Scott Duchess Northumberland 1922-2012 (age 34).
On 21 Jul 1979 Ralph Percy 12th Duke of Northumberland (age 22) and Isobel Jane Richard Duchess of Northumberland (age 21) were married. He the son of Hugh Algernon Percy 10th Duke Northumberland 1914-1988 (age 65) and Elizabeth Diana Montagu-Douglas-Scott Duchess Northumberland 1922-2012 (age 57).
On 31 Oct 1995 [his brother] Henry Percy 11th Duke of Northumberland 1953-1995 (age 42) died from an overdose of amphetamines. He was unmarried . His brother Ralph Percy 12th Duke of Northumberland (age 38) succeeded 12th Duke Northumberland, 9th Earl Beverley, 11th Baron Percy, 15th Baronet Smithson of Stanwick in Yorkshire.
On 29 Apr 2011 William Prince of Wales 1982- (age 28) and Catherine Middleton Princess of Wales (age 29) were married. She by marriage Duchess Cambridge. He the son of King Charles III (age 62) and Diana Spencer Princess Wales 1961-1997. He a grandson of Queen Elizabeth II of the United Kingdom. 
Ralph Percy 12th Duke of Northumberland (age 54) and [his wife] Isobel Jane Richard Duchess of Northumberland (age 52) attended.
Paternal Family Tree: Smithson
Maternal Family Tree: Caroline Eliza Farquhar 1814-1890
Kings Wessex: Great x 26 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 23 Grand Son of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 29 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 24 Grand Son of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 8 Grand Son of King Charles II of England Scotland and Ireland
Kings Scotland: Great x 19 Grand Son of Robert "The Bruce" I King Scotland
Kings Franks: Great x 23 Grand Son of Louis VII King Franks
Kings France: Great x 10 Grand Son of Henry IV King France
Great x 4 Grandfather: Algernon Percy 1st Earl Beverley 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: George Percy 5th Duke Northumberland 1778-1867 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Isabella Susan Burrell Countess Beverley 1750-1812
Great x 2 Grandfather: Algernon George Percy 6th Duke Northumberland 1810-1899 10 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: James Archibald Stuart-Wortley-Mackenzie
9 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandmother: Louisa Harcourt Stuart-Wortley-Mackenzie 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Margaret Cunynghame
Great x 1 Grandfather: Henry George Percy 7th Duke Northumberland 11 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: Henry Drummond
Great x 2 Grandmother: 15 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Robert Hay-Drummond 10th Earl Kinnoul 13 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Henrietta Hay-Drummond 14 x Great Grand Daughter of King Edward III of England
GrandFather: Alan Ian Percy 8th Duke Northumberland 1880-1930 12 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: John Campbell 5th Duke Argyll 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: John Douglas Edward Henry Campbell 7th Duke Argyll 1777-1847 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Elizabeth Gunning Duchess Hamilton and Argyll
Great x 2 Grandfather: George Douglas Campbell 8th Duke Argyll 10 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: John Glassel
Great x 3 Grandmother: Joan Glassel
Great x 1 Grandmother: Edith Campbell Duchess Northumberland 1849-1913 11 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: George Granville Leveson-Gower 1st Duke Sutherland 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: George Sutherland Leveson-Gower 2nd Duke Sutherland 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Elizabeth Sutherland Duchess Sutherland 19th Countess Sutherland 9 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 2 Grandmother: Elizabeth Georgiana Leveson-Gower Duchess Argyll -1878 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: George Howard 6th Earl Carlisle 1773-1848
9 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandmother: Harriet Elizabeth Georgiana Howard Duchess Sutherland 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Georgiana Cavendish Countess Carlisle 1783-1858
9 x Great Grand Daughter of King Henry VII of England and Ireland
Father: Hugh Algernon Percy 10th Duke Northumberland 1914-1988 7 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Charles Lennox 4th Duke Richmond
2 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 3 Grandfather: Charles Gordon-Lennox 5th Duke Richmond 1791-1860 3 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandmother: Charlotte Gordon Duchess Richmond 1768-1842 9 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 2 Grandfather: Charles Gordon-Lennox 6th Duke Richmond 4 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Henry William Paget 1st Marquess Anglesey
13 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Caroline Paget Duchess Richmond 1796-1874 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Caroline Elizabeth Villiers Duchess Argyll
9 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 1 Grandfather: Charles Gordon-Lennox 7th Duke Richmond 5 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Charles Greville
12 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Algernon Frederick Greville 10 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Charlotte Cavendish-Bentinck
9 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 2 Grandmother: Frances Harriett Greville Duchess Richmond 1824-1887 11 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 3 Grandmother: Charlotte Maria Cox
GrandMother: Helen Gordon-Lennox Duchess Northumberland 6 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Ralph Percy 12th Duke of Northumberland 1956- 8 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Charles Scott 4th Duke Buccleuch 6th Duke Queensberry 1772-1819 4 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 3 Grandfather: Walter Scott 5th Duke Buccleuch 7th Duke Queensberry 5 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandmother: Harriet Katherine Townshend Duchess Buccleuch Duchess Queensbury 1773-1814
9 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 2 Grandfather: William Scott 6th Duke Buccleuch 8th Duke Queensberry 6 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Thomas Thynne 2nd Marquess of Bath
10 x Great Grand Son of King Edward IV of England
Great x 3 Grandmother: Charlotte Anne Thynne Duchess Buccleuch Duchess Queensbury 1811-1895 11 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandmother: Isabella Elizabeth Byng Marchioness Bath 1773-1830
10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 1 Grandfather: John Scott 7th Duke Buccleuch 9th Duke Queensberry 1864-1935 5 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: James Hamilton 14 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: James Hamilton 1st Duke of Abercorn 1811-1885 14 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Harriet Douglas Countess Aberdeen 1792-1833 13 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Louisa Jane Hamilton Duchess Buccleuch and Queensbury 4 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: John Russell 6th Duke Bedford
2 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 3 Grandmother: Louisa Jane Russell Duchess Abercorn 1812-1905 3 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandmother: Georgiana Gordon Duchess Bedford 1781-1853 9 x Great Grand Daughter of King Henry VII of England and Ireland
GrandFather: Walter Scott 8th Duke Buccleuch 10th Duke Queensberry 1894-1973 6 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: George Bridgeman 2nd Earl Bradford 1789-1865
11 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: Orlando Bridgeman 3rd Earl Bradford 12 x Great Grand Son of King Henry VII of England and Ireland
Great x 2 Grandfather: George Cecil Orlando Bridgeman 4th Earl Bradford 1845-1915 10 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Cecil Weld-Forester 1st Baron Forester 12 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Selina Weld-Forester Countess Bradford 9 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Katherine Mary Manners Baroness Forester
8 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 1 Grandmother: Margaret Alice "Molly" Bridgeman Duchess Buccleuch Duchess Queensbury 1872-1954 11 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Frederick Lumley-Savile
9 x Great Grand Son of King Edward IV of England
Great x 3 Grandfather: Richard Lumley 9th Earl Scarborough 1813-1884 10 x Great Grand Son of King Edward IV of England
Great x 4 Grandmother: Charlotte Mary Beresford
13 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Ida Frances Annabella Lumley Countess Bradford 1848-1936 11 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandfather: Andrew Robert Drummond
Great x 3 Grandmother: 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Elizabeth Frederica Manners 9 x Great Grand Daughter of King Henry VII of England and Ireland
Mother: Elizabeth Diana Montagu-Douglas-Scott Duchess Northumberland 1922-2012 7 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Henry Lascelles 2nd Earl Harewood 1767-1841
Great x 3 Grandfather: William Lascelles
Great x 2 Grandfather: Frank Cavendish Lascelles 11 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: George Howard 6th Earl Carlisle 1773-1848 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandmother: Caroline Georgiana Howard 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Georgiana Cavendish Countess Carlisle 1783-1858 9 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 1 Grandfather: William Frank Lascelles 12 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: Joseph Francis Olliffe
Great x 2 Grandmother: Emma Olliffe
Great x 4 Grandfather: William Cubitt
Great x 3 Grandmother: Laura Cubitt
Great x 4 Grandmother: Elizabeth Scarlett
GrandMother: Vreda Lascelles Duchess Buccleuch and Queensbury 1900-1993 6 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: William Beauclerk 8th Duke St Albans 1766-1825 2 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 3 Grandfather: William Beauclerk 9th Duke St Albans 3 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 2 Grandfather: William Amelius Aubrey Beauclerk 10th Duke St Albans 1840-1898 4 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 1 Grandmother: Sybil Evelyn De Vere Beauclerk 5 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Charles Grey 2nd Earl Grey
13 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Charles Grey 14 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Mary Elizabeth Ponsonby Countess Grey 1776-1861
13 x Great Grand Daughter of Henry IV King England
Great x 2 Grandmother: Sybil Mary Grey Duchess St Albans 1848-1871 15 x Great Grand Daughter of King Edward III of England
Great x 3 Grandmother: Caroline Eliza Farquhar