Henry I of France whose death Henry was left to deal with his rebel sibling. In 1032, he placated his brother by giving him the duchy of Burgundy which his father had given him in 1016. In an early strategic move, Henry came to the rescue of his very young nephew-in-law, the newly appointed Duke William of Normandy (who would go on to become William the Conqueror), to suppress a revolt by William's vassals. In 1047, Henry secured the dukedom for William in their decisive victory over the vassals at the Battle of Val-ès-Dunes near Caen; however, Henry would later support the barons against
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