Nielsen Hayden genealogy
Descendants of Jaroslawa Rjurikovna of Kiev
Father: Rjurik II Wassilij, Grand Prince of Kiev (Abt 1144 - Abt 1215)
Mother: Anna Georgiewna ( - Between 1205 and 1214)
Jaroslawa Rjurikovna of Kiev
Svjatoslav Igorjewitsch (Abt 1177 - Sep 1211)(m. Oct 1188)
   └─ Agafia Svjatoslava of Novgorod ( - Aft 31 Aug 1247)
    Konrad I of Masovia (Between 1187 and 1188 - 31 Aug 1247)(m. 1207)
       ├─ Casimir I of Kujawien (Abt 1211 - 14 Nov 1267)
       │ Euphrosyne of Oppeln (Between 1228 and 1230 - 4 Nov 1292)(m. 1257)
       │     + Jurij I Lvovitsch, King of Halicz (24 Apr 1252 - 1308)
       └─ 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)
            + Kunigunde of Bohemia (Jan 1265 - 27 Nov 1321)(m. 1291)