The Duchy of Normandy grew out of the 911 Treaty of Saint-Clair-sur-Epte between King Charles III of West Francia and the Viking leader Rollo. The duchy was named for its inhabitants, the Normans.
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
"La Reine, Notre Duc": title of a Diamond Jubilee exhibition at the Jersey Arts Centre
Charles III, called the Simple or the Straightforward, was the king of West Francia from 898 until 922 and the king of Lotharingia from 911 until 919–923. He was a member of the Carolingian dynasty.
Charles the Simple