Page "Henryk IV Probus" Paragraph 17

However, not all the Silesian dukes accepted his authority: Dukes Bolko I the Strict, Konrad II the Hunchback and three of the four sons of Władysław of Opole: Casimir of Bytom, Mieszko I of Cieszyn and Przemysław of Racibórz were completely against Henry's politics.

With the Opole Dukes the situation was more delicate: in 1287, Henry IV obtained the annulment of his marriage with their sister, who was sent back to her homeland.

The fourth of Władysław's sons, Bolko I, remained faithful to Henry IV's politics.