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
Augustus William, Duke of Brunswick-Lüneburg Augustus William, Duke of Brunswick-Lüneburg Augustus William (; 8 March 1662 – 23 March 1731), a member of the House of Welf, was Duke of Brunswick-Lüneburg and ruling Prince of Wolfenbüttel from 1714 until his death. Augustus William was the third, but eldest surviving son of Duke Anthony Ulrich and his consort Elizabeth Juliane, a daughter of Duke Frederick of Schleswig-Holstein-Sønderburg-Norburg. Unlike his father, the young prince was not interested in politics; he studied at the University of Geneva from 1677 to 1678 and afterwards went on a "Grand Tour" from Switzerland to France and the Netherlands. Nevertheless, in 1681