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)
    :           └─ Anna of Silesia (Abt 1325 -
    :            1367 bur.Collegiate Church of the Holy Sepulchre, Legnica, Lower Silesia, Poland)
    :            1367 bur.Collegiate Church of the Holy Sepulchre, Legnica, Lower Silesia, Poland)
    :            Wenzel I of Silesia (Between 1310 and 1318 - 2 Jun 1364 bur.Collegiate Church of the Holy
    :            Sepulchre, Legnica, Lower Silesia, Poland)(m. Between 1338 and 1340)
    :            Sepulchre, Legnica, Lower Silesia, Poland)(m. Between 1338 and 1340)
    :               └─ Ruprecht of Silesia (Between 1340 and 1347 -
    :                Bef 12 Jan 1409 bur.Legnica, Lower Silesia, Poland)
    :                Bef 12 Jan 1409 bur.Legnica, Lower Silesia, Poland)
    :                Jadwiga of Silesia (Bef 1350 - 27 Mar 1390 bur.Legnica, Lower Silesia, Poland)
    :                (m. Bef 10 Feb 1372)
    :                (m. Bef 10 Feb 1372)
    :                   └─ Barbara of Silesia-Liegnitz ( - 16 May 1435)
    :                    Rudolf III of Saxony (Abt 1373 -
    :                    9 Jun 1419 bur.Wittenberg, Saxony-Anhalt, Germany)(m. 6 Mar 1396)
    :                    9 Jun 1419 bur.Wittenberg, Saxony-Anhalt, Germany)(m. 6 Mar 1396)
    :                       └─ Barbara of Saxony (Abt 1406 - 10 Oct 1465 Bayreuth, Bavaria, Germany) =>
    :                        + Johann "the Alchemist" of Brandenburg (Bef 29 Sep 1403 -
    :                        16 Nov 1464 Baiersdorf, Bavaria, Germany)(m. 26 May 1412)
    :                        16 Nov 1464 Baiersdorf, Bavaria, Germany)(m. 26 May 1412)
    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)
           └─ Anna of Masovia (Bef 1324 - 16 Feb 1363)
            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)
               └─ Jadwiga of Silesia (Bef 1350 - 27 Mar 1390 bur.Legnica, Lower Silesia, Poland)
                Ruprecht of Silesia (Between 1340 and 1347 -
                Bef 12 Jan 1409 bur.Legnica, Lower Silesia, Poland)(m. Bef 10 Feb 1372)
                Bef 12 Jan 1409 bur.Legnica, Lower Silesia, Poland)(m. Bef 10 Feb 1372)
                   └─ This couple were related to each other. Any descendants have been already been listed