シロンスク公国
However, this arrangement fell apart when upon the death of Bolesław III and his testament the fragmentation of Poland began, which decisively enfeebled its central authority. The newly established Duchy of Silesia became the ancestral homeland of the Silesian Piasts, descendants of Bolesław's eldest son Władysław II the Exile, who nevertheless saw themselves barred from the succession to the Polish throne and only were able to regain their Silesian home territory with the aid of the Holy Roman Emperor.