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, Duke of Austria William, Duke of Austria William ( – 15 July 1406), known as William the Courteous (), a member of the House of Habsburg, was Duke of Austria from 1386. As head of the Leopoldian line, he ruled over the Inner Austrian duchies of Carinthia, Styria and Carniola as well as the County of Tyrol and Further Austria from 1396 until his death. Born in Vienna, William was the oldest son of Duke Leopold III of Austria (1351–1386) and his consort Viridis Visconti (1352–1414), a daughter of Lord Bernabò of Milan. Leopold III had already acted as regent over the Tyrol