Siewierz

The Duchy of Siewierz was a small Silesian Piast principality centred on Siewierz. In 1337 Władysław of Bytom sold Siewierz to Casimir I of Cieszyn.

In 1443 Wenceslaus I of Cieszyn sold the duchy for six thousand Prague groschen to Zbigniew Oleśnicki, bishop of Kraków. The bishops ruled it with its own laws, treasury and army until the Great Sejm incorporated it into the Polish Crown in 1790. Prussia took it in 1795, and it passed to Russian-ruled Congress Poland in 1815.