One bit of irony I’ve always enjoyed about those taking pride in claiming descent from the Conquest is that doing so essentially means that you’re both French and once swore fealty to a bastard. All of today’s monarchy, in fact, can be traced back to an illegitimate French duke who was scrappier than he was “to the manor born.”
William the Conqueror, otherwise known as William I or William the Bastard, was the illegitimate son of Robert I, Duke of Normandy and a mistress, usually known simply Herleva. The daughter of a tanner, she may have met the duke as a member of his household, but she certainly wasn’t lofty enough to marry him and become duchess. Her son, however, was a different story, which underlines the general flexibility of succession back in the day. Yes, a legitimate eldest son was generally considered the heir, but in the absence of one, all sorts of back bends could be accomplished.