Jadwiga of Masovia Polish princess (1392–1439) Parents Alexandra of Lithuania Siemowit IV Children Dorothy Garai Siblings Trojden II of Płock Euphemia of Masovia Siemowit V of Masovia Maria of Masovia Władysław I of Masovia Catherine of Masovia Casimir II of Masovia Cymburgis of Masovia Amelia of Masovia Anna of Masovia Aleksander Mazowiecki Partners János Garai