Charlotte Percy, Duchess of Northumberland
Charlotte Florentia Percy, Duchess of Northumberland(" née" Lady Charlotte Florentia Clive; 12 September 1787 – 27 July 1866), was governess of the future Queen Victoria of the United Kingdom.
Eleanor Percy, Duchess of Northumberland
Eleanor Percy, Duchess of Northumberland (1820–1911) was the wife of Algernon Percy, 4th Duke of Northumberland.
Eleanor Percy, Duchess of Buckingham
Eleanor Percy, Duchess of Buckingham( – 13 February 1530), also known as Alianore, was the eldest daughter of Henry Percy, 4th Earl of Northumberland, by his wife, Lady Maud Herbert, daughter of William Herbert, 1st Earl of Pembroke.
Eleanor Percy married Edward Stafford, 3rd Duke of Buckingham, who was beheaded in 1521 on false charges of plotting to overthrow the king, Henry VIII.
As a result, the Dukedom of Buckingham and estates were forfeited, and her children lost their inheritance.
Eleanor Percy Lee
Eleanor Percy Lee, born Eleanor Percy Ware( 1819– 1849), was an American writer of Mississippi who co-authored two books of poetry with her sister Catherine Anne Warfield; these were published in the 1840s.
The sisters were indirect ancestors of the famed southern writers William Alexander Percy and Walker Percy.
Eleanor died in a yellow fever epidemic.
Jane Percy, Duchess of Northumberland
Isobel Jane Miller Percy, Duchess of Northumberland( née Richard; born 11 May 1958), is a British businesswoman.
She has served as Lord Lieutenant of Northumberland since 2009, and is best known for redeveloping The Alnwick Garden at Alnwick Castle.
She is the first woman to serve as Lord Lieutenant of Northumberland.
Her husband, Ralph, is the 12th Duke of Northumberland.
Helen Percy, Duchess of Northumberland
Helen Percy, Duchess of Northumberland,( 13 December 1886 – 13 June 1965), was born as Helen Magdalan Gordon- Lennox, the daughter of Charles Gordon- Lennox, Earl of March and Kinrara( later the 7th Duke of Richmond).
She was married on 18 October 1911 to Earl Percy, who succeeded his father as 8th Duke of Northumberland in 1918, whereupon she became known as the Duchess of Northumberland.
The couple had six children:
She was Mistress of the Robes to Queen Elizabeth, the Queen Mother, from 1937 to 1964 and was appointed a Dame Grand Cross of the Royal Victorian Order in 1938.
Elizabeth Percy, Duchess of Northumberland
Elizabeth Percy, Duchess of Northumberland( née" Seymour"; 26 November 1716 – 5 December 1776), also" suo jure" 2nd Baroness Percy, was a British peer.
Elizabeth Percy, Duchess of Northumberland (born 1922)
Elizabeth Diana Percy, Duchess of Northumberland( née Lady Elizabeth Montagu Douglas Scott; 20 January 1922 – 19 September 2012)
Henry Stafford, 1st Baron Stafford
Henry Stafford, 1st Baron Stafford( 18 September 1501 – 30 April 1563) was born in Penshurst, Kent, eldest son of Edward Stafford, 3rd Duke of Buckingham and Eleanor Percy, Duchess of Buckingham.
Eleanor( or Alianore) was the daughter of Henry Percy, 4th Earl of Northumberland and Maud Herbert, Countess of Northumberland.
After his father's execution he managed to regain some of his family's position and he was created Baron Stafford in 1547.
Algernon Percy, 4th Duke of Northumberland
Admiral Algernon Percy, 4th Duke of Northumberland, (15 December 1792 – 12 February 1865), styled Lord Algernon Percy from birth until 1816 and known as Lord Prudhoe between 1816 and 1847, was a British naval commander, explorer and Conservative politician.

Question: What is the date of birth of Eleanor Percy, Duchess Of Northumberland's husband?
Answer: 15 December 1792