Nielsen Hayden genealogy
Family: Rosztiszlo, King of Bulgaria; Grand Duke of Kiev / Anna of Hungary (F14992)
m. 1244St. Michael of Chernigov, Grand Prince of Kiev (1185-1246) 
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Marija Romanowna of Halicz ( -1242)
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| Béla IV, King of Hungary (1206-1270)
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| Maria Laskarina (1206-1270)
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Istvan V, King of Hungary (1239-1272)  |
| Helene of Hungary (1244-1298) |
| Rosztiszlo, King of Bulgaria; Grand Duke of Kiev (1212-1264)
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| Anna of Hungary (1226- )
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| Kunhata of Slavonia and Machva (1245-1285) |