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
Baldwin V, Count of Flanders Baldwin V, Count of Flanders Baldwin V of Flanders (c. 1012 – 1 September 1067) was Count of Flanders from 1035 until his death. He was the son of Baldwin IV, Count of Flanders, who died in 1035. In 1028 Baldwin married Adèle of France in Amiens, daughter of King Robert II of France; at her instigation he rebelled against his father but in 1030 peace was sworn and the old count continued to rule until his death. During a long war (1046–1056) as an ally of Godfrey the Bearded, Duke of Lorraine, against the Holy Roman Emperor Henry III,