William the Conqueror France, Henry I, enabling him to succeed to his father's duchy. The support given to the exiled English princes in their attempt to return to England in 1036 shows that the new duke's guardians were attempting to continue his father's policies, but Archbishop Robert's death in March 1037 removed one of William's main supporters, and conditions in Normandy quickly descended into chaos. The anarchy in the duchy lasted until 1047, and control of the young duke was one of the priorities of those contending for power. At first, Alan of Brittany had custody of the duke, but when Alan died
William, Duke of Jülich-Cleves-Berg William, Duke of Jülich-Cleves-Berg William of Jülich-Cleves-Berge (William I of Cleves, William V of Jülich-Berg) (; 28 July 1516 – 5 January 1592) was a Duke of Jülich-Cleves-Berg (1539–1592). William was born in and died in Düsseldorf. He was the only son of John III, Duke of Jülich-Cleves-Berg, and Maria, Duchess of Jülich-Berg. William took over rule of his father's estates (the Duchy of Cleves and the County of Mark) upon his death in 1539. Despite his mother having lived until 1543, William also became the Duke of Berg and Jülich and the Count of Ravensberg. From 1538 to 1543,