Duchy of Münsterberg
After his father died in 1452, his uncle Ernest took up the guardianship of Frederick and his two brothers and two sisters. The three brothers (Frederick, Wenceslas III, and Przemko III) had jointly inherited two thirds of the Duchy of Opava. The remaining third was held by their cousin John II. Their father had held the Duchy of Münsterberg for a while, however, Frederick and his brothers did not inherit it, because their father had swapped it with Ernest for the latter's third of Opava. Ernest, in his capacity as their guardian, sold the brothers' two-thirds of Opava in 1464 to Duke Bolko V of Opole. John II retained his third.