Зембицкое княжество
William died in 1452. His brother Ernest took up the guardianship of William's children. As their guardian, he sold William's 2/3 share of Opava to Duke Bolko V of Opole, in or after 1454. On 8 March 1456, Ernest sold the Duchy of Münsterberg to George of Poděbrady, who would be elected King of Bohemia in 1458. George purchased the 1/3 share of Opava after Bolko's death from the latter's brother Nicholas I and in 1464, he purchased the other 2/3 in Opole in 1464 from John II, thereby considerable increasing his political and economic influence in Silesia.