Władysław of Bytom

In 1328, Mieszko formally resigned his domain over Siewierz on Władysław's behalf and one year later (1329), the death of Bolesław allowed the Duke of Koźle to reunite the whole paternal lands under his rule.

Leszek died two years later, in 1336, and according to the terms of the pledge Koźle would return to Władysław, but soon after he was forced to give this lands to his eldest son Casimir, and after his death in 1347, the town was given to his younger brother Bolesław.

Władysław's extremely cautious politics radically changed: in the course of Polish-Bohemian War during the years 1345-1348 he stood at the side of the Polish Kingdom, especially after the unexpected victories in the Battles of Pogoń (now Sosnowiec) and Lelów.

In 1345 Władysław could repelled the attack of the Bohemian troops and on 15 February 1346 he signed a treaty with King Casimir III of Poland under which the latter agreed to provide military help against Bohemia.

Soon before his death, Władysław concluded an agreement with the Bohemian King allowing the succession of women in his Duchy, which happened in 1355 and caused the division of Bytom between the Dukes of Oleśnica and Cieszyn.