William the Conqueror

William the Conqueror defeated King Harold Godwinson in the Battle of Hastings in 1066. 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 when a group of Saxons ran the Monk out of his monastery. (TV: The Time Meddler)

He died in 1087. (PROSE: Vampire Science)

According to the Sixth Doctor, the Normans remained on the throne for the next "dozen or so" generations. (PROSE: The Real Hereward)