Maria of Galicia Princess of Galicia-Volhynia (1293–1341) Parents Euphemia of Kuyavia Yuri Boleslavovitch Children Bolesław Jerzy of Mazovia Siemowit III, Duke of Masovia Casimir of Masovia Eufemia of Masovia Siblings Lev II of Galicia Anastasia of Galicia Andrew of Galicia Partners Trojden I, Duke of Masovia