George IV William of Legnica
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George IV William, Georg Wilhelm Duke of Liegnitz-Brieg-Wohlau (Polish: Jerzy IV Wilhelm, born September 29 in Ohlau Oława, 1660, died November 21, 1675 in Brieg Brzeg) was the son of Duke Christian of Liegnitz-Brieg-Wehlau and Luise of Anhalt-Dessau and the last ruling member of the Silesian Piast dynasty. His uncle Augustus Graf of Liegnitz was the last legitimate descendend of the until then independend duchy of Liegnitz-Brieg-Wehlau.
The independend Masovian Piasts died out in 1526, the Teschen Line died out in 1625 and therefore George William was the last of all Piasts. Upon his death the imperial house of Habsburg took up the government.