Cardinal Olesnicki, who is also bishop of…

Cardinal Olesnicki, who is also bishop of Kraków, purchases the city of Siewierz from Duke Waclaw I of Cieszyn, who is deeply in debt, on December 30, 1443, for six thousand Prager Groschen.

The city becomes the seat of the bishops of Kraków, who receive also the title dukes of Siewierz, the duchy being not a part of Poland.