Euphemia of Bytom 1350/1352 - 26 Aug 1411 (1350–1411) Parents Margareta of Sternberg Bolesław of Bytom Children Euphemia of Ziębice John I of Ziębice Henry II, Duke of Ziębice Katharina von Münsterberg Siblings Elżbieta of Bytom-Koźle Bolka of Bytom Partners Bolko III of Ziębice Wenceslaus of Niemodlin