George William, Duke of Liegnitz (died 1675)

George William, also known as George IV William was the last Silesian duke of Legnica (Liegnitz) and Brzeg (Brieg) from 1672 until his death. He was the last male member of the Silesian Piast dynasty descending from Władysław II the Exile (1105–1159), as well as the last legitimate male member of the entire House of Piast.