瓦迪斯瓦夫三世
The death of Sigismund in 1437 was followed by challenges. The Bohemian crown was disputed between Albert II of Habsburg and Władysław III of Poland. After Albrecht's early death in 1439 his widow Elisabeth renewed these claims. Silesia, lying between Poland and Bohemia, again became a battleground. The majority of Silesian princes supported Elisabeth. After Wladislaus died in 1444, Bohemia's interim regent George of Poděbrady was elected king in 1458 and enfeoffed his two sons with the Silesian duchies of Münsterberg (Ziębice) and Opava (Troppau), and Bohemian territory Kladsko (Glatz), which thereby became closer to Silesia. He appointed Czech peers as governors of Silesian hereditary principalities and thus made Czech the official language for large parts of Silesia.