Bolesław II of Masovia Duke of Masovia (1251–1313) Parents Pereiaslawa of Galicia Siemowit I of Masovia Children Wenceslaus of Płock Euphrosyne of Masovia Anna of Mazovia Trojden I, Duke of Masovia Siemowit II of Masovia Siblings Konrad II of Masovia Partners Kunigunde of Bohemia Gaudemunda of Lithuania
