Nielsen Hayden genealogy
Descendants of Svjatoslav II Nikolaj
Abt 1086 - 1164 (~ 78 years)Father: Oleg Michael (Abt 1058 - 1 Aug 1115)
Mother: Theophano Musalonissa
Svjatoslav II Nikolaj (Abt 1086 - 15 Feb 1164)
Marija of Novgorod ( - Apr 1164)(m. 1136)
   └─ Igor Svjatoslavitsch (10 Apr 1151 - 1202)
    Jewfrosinja Jaroslavna of Halicz
       └─ Svjatoslav Igorjewitsch (Abt 1177 - Sep 1211)
        Jaroslawa Rjurikovna of Kiev (m. Oct 1188)
           └─ Agafia Svjatoslava of Novgorod ( - Aft 31 Aug 1247) =>
            + Konrad I of Masovia (Between 1187 and 1188 - 31 Aug 1247)(m. 1207)