Oświęcim

The Duchy of Oświęcim lay in Lesser Poland east of the Biała River. In 1337 Duke Jan I the Scholastic ruled as a Bohemian vassal, having paid homage to King John of Bohemia in 1327.

Partitions reduced the duchy, with Zator and Toszek separated in 1445. Duke Jan IV became a vassal of Poland's Casimir IV in 1454 and sold Oświęcim to the Polish Crown for three million Prague groschen in 1457. The Sejm incorporated it into Kraków Voivodeship in 1564; the Habsburgs acquired it in 1772.