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
George William, Duke of Liegnitz George William, Duke of Liegnitz George William (), also known as George IV William ; ; 29 September 1660 – 21 November 1675) was the last Silesian duke of Legnica and Brzeg from 1672 until his death. He was the last male member of the Silesian Piast dynasty descending from Władysław II the Exile (1105–1159). George William was the eldest but only surviving son of Duke Christian of Legnica-Brzeg (1618-1672) by his wife Louise (1631-1680), a daughter of the Ascanian prince John Casimir of Anhalt-Dessau. He had three siblings: As the only surviving son, George William was the sole heir