Nielsen Hayden genealogy
Descendants of Constance of Hungary
Father: Béla IV, King of Hungary (1206 - 3 May 1270)
Mother: Maria Laskarina (Abt 1206 of Nicea, Anatolia - 1270)
Constance of Hungary
Leo Danilowitsch, King of Halicz (Abt 1228 - 1301)(m. Between 1251 and 1252)
   └─ Jurij I Lvovitsch, King of Halicz (24 Apr 1252 - 1308)
    Euphemia of Kujawien ( - 18 Mar 1308)
       └─ Marija Jurjewma of Halicz (Bef 1293 - 11 Jan 1341)
        Trojden I of Masovia (Between 1284 and 1286 - 13 Mar 1341)(m. Bef 1310)
           └─ Euphemia of Masovia (Abt 1310 - Aft 1373 bur.Cieszyn, Silesia, Poland) =>
            + Casimir I of Silesia (Between 1276 and 1280 - Aft 21 Sep 1358 bur.Cieszyn, Silesia, Poland)
            (m. Between 1321 and 1324)
            (m. Between 1321 and 1324)