William the Conqueror

William the Conqueror was the Duke of Normandy who became king of England in 1066 by defeating King Harold Godwinson in the Battle of Hastings. The Monk planned to change history by ensuring Harold's army would be better able to face William's army, but this plan was defeated by the First Doctor. (TV: The Time Meddler)

He died in 1087. (PROSE: Vampire Science)