Nielsen Hayden genealogy
Descendants of Siemowit I of Masovia
Abt 1228 - 1262 (~ 34 years)Father: Konrad I of Masovia (Between 1187 and 1188 - 31 Aug 1247)
Mother: Agafia Svjatoslava of Novgorod ( - Aft 31 Aug 1247)
Siemowit I of Masovia (Abt 1228 - 23 Jun 1262)
Pereslajawa Danilovna of Halicz ( - 12 Apr 1283)(m. Abt 1248)
   └─ Boleslaw II of Masovia (Abt 1251 - 20 Apr 1313)
    Gaudimanté of Lithuania ( - Between 1288 and 1313)(m. 1279)
    :   └─ Trojden I of Masovia (Between 1284 and 1286 - 13 Mar 1341)
    :    Marija Jurjewma of Halicz (Bef 1293 - 11 Jan 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)
    Kunigunde of Bohemia (Jan 1265 - 27 Nov 1321)(m. 1291)
       └─ Waclaw of Masovia (Abt 1293 - 23 May 1336)
        Dannila of Lithuania ( - 1364)(m. Bef 6 Dec 1320)
            + Heinrich III of Silesia (Between 1312 and 1321 -
            13 Apr 1369 bur.Augustinian Cloister, Zagan, Zagan, Silesia, Poland)(m. Bef 6 Sep 1337)
            13 Apr 1369 bur.Augustinian Cloister, Zagan, Zagan, Silesia, Poland)(m. Bef 6 Sep 1337)