Casimir I of Kuyavia Polish prince (c. 1211 – 1267) (1211–1267) Parents Agafia of Rus Konrad I of Masovia Children Euphemia of Kuyavia Ziemomysł of Kuyavia Władysław I the Elbow-high Siemowit, Duke of Kuyavia-Brieg Leszek II the Black Casimir II of Łęczyca Siblings Judith of Masovia Bolesław I of Masovia Siemowit I of Masovia Eudoxia of Masovia Dubrawka of Masovia Partners Euphrosyne of Opole Jadwiga Constance of Wrocław
