Battle of Mortemer [SEP] point in time
Battle of Mortemer
The Battle of Mortemer was a defeat for Henry I of France when he led an army against his vassal, William the Bastard, Duke of Normandy in 1054. William was eventually to become known as William the Conqueror after his successful invasion and conquest of England.
Background.
William the Bastard became Duke of Normandy as a boy. His reign did not start well, and he had to experience twenty years of internal strife. The chronicler William of Jumièges reported that the duke's guardian, his
Walter Giffard, Roger of Mortemer, and William de Warenne, faced the other invading force. This second force defeated the invaders at the Battle of Mortemer. In addition to ending both invasions, the battle allowed the duke's ecclesiastical supporters to depose Mauger from the archbishopric of Rouen. Mortemer thus marked another turning point in William's growing control of the duchy, although his conflict with the French king and the Count of Anjou continued until 1060. Henry and Geoffrey led another invasion of Normandy in 1057 but were defeated by William