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, Duchess of Northumberland
Eleanor Percy, Duchess of Northumberland( 1820–1911) was the wife of Algernon Percy, 4th Duke of Northumberland.
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)
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.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
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.
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.
Elizabeth Stafford, Duchess of Norfolk
Lady Elizabeth Stafford(" later" Duchess of Norfolk)( c. 1497 – 30 November 1558) was the eldest daughter of Edward Stafford, 3rd Duke of Buckingham and Lady Eleanor Percy.
By marriage she became Duchess of Norfolk.
Her abusive marriage to Thomas Howard, 3rd Duke of Norfolk, created a public scandal.
Edward Stafford, 3rd Duke of Buckingham
Edward Stafford, 3rd Duke of Buckingham (3 February 1478 – 17 May 1521) was an English nobleman.
He was the son of Henry Stafford, 2nd Duke of Buckingham, and Katherine Woodville, and nephew of Elizabeth Woodville and King Edward IV.
Thus Edward Stafford was a first cousin once removed of King Henry VIII.
He was convicted of treason and executed on 17 May 1521.
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.

Question: What is the date of death of Eleanor Percy, Duchess Of Buckingham's husband?
Answer: 17 May 1521