Marquis of Buckingham

Duke of Buckingham, referring to Buckingham, is a title that has been created several times in the peerages of England, Great Britain, and the United Kingdom. There have also been Earls of Buckingham and Marquesses of Buckingham.

The first creation of the dukedom was on 14 September 1444, when Humphrey Stafford, 6th Earl of Stafford, was made Duke of Buckingham.

On his father's side, Stafford was descended from Edmond de Stafford, who had been summoned to Parliament as Lord Stafford in 1299. The second Baron had been created Earl of Stafford in 1351. On his mother's side, Stafford was the son of Anne of Gloucester, Countess of Buckingham, daughter of (later Duke of Gloucester), youngest son of King Edward III of England. Stafford was an important supporter of the House of Lancaster in the Wars of the Roses, and was killed at the Battle of Northampton in July 1460.

The 1st Duke of Buckingham was succeeded by his grandson, Henry Stafford, 2nd Duke of Buckingham, who aided Richard III in his claiming the throne in 1483 (Edward IV of England's marriage to Elizabeth Woodville having been declared null and void and Edward's sons illegitimate by Act of Parliament Titulus Regius), but who then led a revolt against Richard and was executed later that same year. His titles were forfeited along with the dukedom.

...
Wikipedia