Margaret of Masovia Duchess consort of Pomerania and Brzeg (Brieg) (d. 1388) Parents Euphemia of Opava Siemowit III, Duke of Masovia Children Louis II of Brieg Margaret of Brzeg Siblings Euphemia of Masovia Siemowit IV Henry of Masovia Janusz I of Warsaw Stanisław Siemowit of Masovia Partners Casimir IV, Duke of Pomerania Henry VII of Brzeg
