Duke of Normandy as the reign of William II (1035–87), the ruler of Normandy could style himself "prince and duke, count of Normandy" as if unsure what his title should be. The literal Latin equivalent of "Duke of Normandy", "dux Normanniae", was in use by 1066, but it did not supplant "dux Normannorum" until the Angevin period (1144–1204), at a time when Norman identity was fading. Richard I experimented with the title "marquis" ("marchio") as early as 966, when it was also used in a diploma of King Lothair. Richard II occasionally used it, but he seems to have preferred the title duke.
William II, Duke of Bavaria William II, Duke of Bavaria Duke William II of Bavaria-Straubing KG (5 April 1365—31 May 1417) was also count William IV of Holland, count William VI of Hainaut and count William V of Zeeland. He ruled from 1404 until 1417, when he died from an infection caused by a dog bite. William was a son of Albert I and Margaret of Brieg. William, allied with the Hooks, was in conflict with his father until 1394. In 1404 he succeeded him as Count of Holland, Zeeland and Hainaut and duke of Bavaria-Straubing. In 1408 in the Battle of Othée William and