Nielsen Hayden genealogy
Descendants of Marija of Novgorod
![Female](img/tng_female.gif)
Father: Petril of Novgorod
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Marija of Novgorod ( - Apr 1164)
           └─ Agafia Svjatoslava of Novgorod
( - Aft 31 Aug 1247) =>
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            + Konrad I of Masovia
(Between 1187 and 1188 - 31 Aug 1247)(m. 1207)
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