The Duke of Normandy was a title held by the rulers of the historical region of Normandy in northern France. This title became prominent in the 10th century when the Viking leader Rollo was granted land by the French king, establishing the Duchy. The dukes played a significant role in medieval politics and were influential in the development of feudalism in France. One of the most famous Dukes of Normandy was William the Conqueror, who became the first Norman king of England after his victory at the Battle of Hastings in 1066. The title continued to hold importance until the French crown absorbed Normandy in the 13th century, but it remains a significant part of European history.