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 of Jumièges "De moribus et actis primorum Normannorum ducum", between c. 996 and c. 1015. This work was commissioned by Duke Richard I, and "was renewed by his half-brother, Count Rodulf of Ivry, and his son Duke Richard II (996-1026)... Dudo's work was taken up by William of Jumièges in the 1050s, who revised, abbreviated and updated his "De moribus" and added an account of the reigns of Dukes Richard II, Richard III (1026-7), Robert I (1027-35), and William II [William the Conqueror]." He finished this by 1060 but added to it later when William the Conqueror had become king of England,