シロンスク・ピャスト家
Despite formal papal consent for the coronation, Wladyslaw's right to the crown was disputed by successors of Wenceslaus III (a king of both Bohemia and Poland) on the Bohemian throne. In 1327 John of Bohemia invaded. After the intervention of King Charles I of Hungary he left Polonia Minor, but on his way back he enforced his supremacy over the Upper Silesian Piasts.