In 1352, Duke Bolesław inherited the Duchy of Bytom but died suddenly in Italy three years later (1355).
In his will, he left Bytom to Margareta as her dower; however, the disputes soon began over the inheritance of the Duchy of Koźle-Bytom between the Dukes of Oleśnica and Cieszyn, who claimed rights by virtue of the treaty signed between Duke Władysław of Bytom and the Bohemian Kingdom, under which the succession of women over the Duchy in absence of male heirs was allowed.
Koźle was taken by Duke Konrad I of Oleśnica (who claimed the rights of his wife Euphemia, eldest half-sister of Bolesław).
After two years of conflicts, on 8 December 1357 a settlement was made: Bytom was divided between the Dukes Konrad I of Oleśnica and Casimir I of Cieszyn, legal guardian of Bolesław's daughters, who were forced to renounce their rights over the Duchy.
Three years later, in 1360, the new Duke of Cieszyn, Przemysław I Noszak, married Elisabeth, the eldest daughter of Bolesław, and with this acquired additional rights over the half of Bytom.