Duchy of Münsterberg
After his father's death in 1452, his brother Ernest took up the guardianship of Przemko and his four siblings. Przemko III and his brothers Frederick and Wenceslas III inherited a two thirds share of the Duchy of Opava; their cousin john II held the remaining third. Their father had held the Duchy of Münsterberg for a while, however, Przemko and his brothers did not inherit it, because their father had swapped it with Ernest for the latter's third of Opava. The brothers nevertheless sometimes used the title of "Duke of Münsterberg". 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 share.