In the Middle Ages, the duke of Normandy was the ruler of the Duchy of Normandy. The duchy arose out of a grant of land to the Viking leader Rollo by the French king Charles the Simple in 911. In 924
"La Reine, Notre Duc" (The Queen, Our Duke): title of a Diamond Jubilee exhibition at the Jersey Arts Centre in the Channel Islands
Statue of Rollo, founder of the fiefdom of Normandy, standing in Falaise, Calvados, birthplace of his descendant William the Conqueror, the Duke of Normandy who became King of England