William, Duke of Opava Duke of Opava and Münsterberg (1410–1452) Parents Katharina von Münsterberg Přemek I, Duke of Opava Children Frederick, Duke of Opava Wenzel III. Anna Opavská Przemko III, Duke of Opava Kateřina Opavská Siblings Wenceslaus II, Duke of Opava Ernest, Duke of Opava Przemko II, Duke of Opava Nicholas IV, Duke of Opava Partners Salome of Častolovice