Strzelce
Strzelce was an Upper Silesian Piast duchy centred on Strzelce. In 1337 Duke Albert, who had received it in 1323, was a vassal of Bohemia.
Albert left only a daughter, so on his death around 1375 Strzelce passed to his nephew Bolko III, then in 1382 to Bolko's sons under Władysław Opolczyk. When Jan II of Opole died childless in 1532, the land reverted to the Bohemian Crown and passed to the Hohenzollerns of Brandenburg-Ansbach. The Polish Vasas held it from 1645 to 1666; Prussia annexed it in 1742.