Henry Beauclerc, the youngest and last surviving son of William the Conqueror, served as King Henry I of England after the death of his older brother, William II, in 1100. Nineteen years into his reign, he and his only legitimate son, William the Atheling, celebrated a successful military campaign against Louis VI of France, and the marriage of the teenaged William to Matilda of Anjou, the daughter of a powerful French Count. They remained in Normandy for some time and, on November 25, 1120, King Henry, Prince William, and their respective entourages prepared to cross the English Channel and return to London.