Зембицкое княжество
After William's death in 1452, the Duchy of Münsterberg fell to Ernest, according to the agreement of 1451. Ernest also took up the guardianship of William's children. As their guardian, he sold William's 2/3 share of the Opava to Duke Bolko V of Opole, after 1454. On 8 March 1456, he sold the Duchy of Münsterberg to the provincial administrator and future King of Bohemia, George of Poděbrady.