Nielsen Hayden genealogy
Family: Frederick I of Swabia / Agnes of Germany (F52)
m. Abt 1086Frederick of Büren (1020-1053) 
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Hildegard of Egisheim-Dagsburg (1028-1095)
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| Heinrich IV, Holy Roman Emperor (1050-1106)
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| Bertha of Turin (1051-1087)
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| Frederick I of Swabia (1050-1105)
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| Agnes of Germany (1073-1143)
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Heilika of Swabia (1087-1111)  |
| Frederick II von Hohenstaufen (1090-1147) |
| Konrad III of Swabia, King of the Romans (1093-1152) |