The Dukes of Normandy were powerful rulers in medieval France, governing the region of Normandy. This title emerged in the 10th century when the Viking leader Rollo was granted land by the French king, establishing a lineage of dukes who played a significant role in European history. The most famous of these dukes was William the Conqueror, who became the first Norman king of England after his victory at the Battle of Hastings in 1066. The Dukes of Normandy were influential in shaping the political landscape of both France and England, with their legacy lasting for centuries.