George Villiers

George Villiers, 1st Duke of Buckingham was a minister and close friend of King Charles I. Buckingham once smuggled an English army into France to take Paris. He lost a sword fight to the Fifth Doctor and was forced to return to England.

The Doctor later told his companions Peri Brown and Erimem that Buckingham would meet his death at the hands of a Puritan assassin named John Felton in 1628. (BFA: The Church and the Crown)