Louis II of Hungary
After the death of King Louis II of Hungary and Bohemia in 1526, Ferdinand I of Austria was elected King of Bohemia and thus ruler of the Crown of Bohemia (including Silesia). In 1537, the Piast Duke Frederick II of Brieg concluded the Treaty of Brieg with Elector Joachim II of Brandenburg, whereby the Hohenzollerns of Brandenburg would inherit the Duchy of Brieg upon the extinction of the Piasts, but Ferdinand rejected the treaty.