Maria of Masovia politician (d. 1454) Parents Alexandra of Lithuania Siemowit IV Children Alexandra of Pomerania Sophie of Pomerania, Duchess of Pomerania Siblings Trojden II of Płock Jadwiga of Masovia Amelia of Masovia Cymburgis of Masovia Casimir II of Masovia Catherine of Masovia Władysław I of Masovia Euphemia of Masovia Siemowit V of Masovia Anna of Masovia Aleksander Mazowiecki Partners Bogislaw IX, Duke of Pomerania
