I’ve heard of William the Conqueror. Also Not Known As (ANKA) William the Bastard?
How did William the Bastard become William the Conqueror? - BBC
http://www.bbc.co.uk/timelines/zp88wmn
William’s mother was not married to William’s father. Through the Middle Ages up until the mid 20th Century, Bastard was the term used for children of un-wed parents.
He was known as William I; William the Conquerer; William the Bastard; the first Norman King of England.