Euphrosyne of Masovia Masovian noblewoman (1292–1327) Parents Bolesław II of Masovia Kunigunde of Bohemia Children Anna of Oświęcim Jan I the Scholastic Siblings Siemowit II of Masovia Trojden I, Duke of Masovia Wenceslaus of Płock Anna of Mazovia Partners Władysław of Oświęcim
