William the Conqueror eldest son. William was the son of the unmarried Robert I, Duke of Normandy, by Robert's mistress Herleva. His illegitimate status and his youth caused some difficulties for him after he succeeded his father, as did the anarchy that plagued the first years of his rule. During his childhood and adolescence, members of the Norman aristocracy battled each other, both for control of the child duke and for their own ends. In 1047 William was able to quash a rebellion and begin to establish his authority over the duchy, a process that was not complete until about 1060. His marriage
George William, Duke of Liegnitz traced back through the generations. George William, Duke of Liegnitz was the last legitimate male of the Piast dynasty. Descent before Mieszko I is partly fictional. This is the descent of the primary male heir. 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