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
Adolf William, Duke of Saxe-Eisenach Adolf married Marie Elisabeth of Brunswick-Wolfenbüttel. They had five children: Adolf lost all his sons shortly after birth, and his widow was pregnant with their fifth child at the time of his death. Eight days later, a son was born, called Wilhelm August, who inherited the estates of his father (under the regency of his uncle Johann Georg), until his death at only two years of age, whereupon Johann Georg inherited the estates. Adolf William, Duke of Saxe-Eisenach Adolf Wilhelm, Duke of Saxe-Eisenach (Weimar, 15 May 1632 – Eisenach, 21 November 1668), was a duke of Saxe-Eisenach. He was the