The first Duke of Berwick was the illegitimate son of this English monarch.
James II
William III
Queen Anne
Charles II
James II. The duchy of Berwick was created for James FitzJames, an illegitimate son of James II, with Arabella Churchill, sister of the Duke of Marlborough. He fled England with his father after the Glorious Revolution in 1688 and took refuge within France. He participated in James’ invasion of Ireland and fought at the Battle of the Boyne.