Nielsen Hayden genealogy
Family: Friedrich II, Holy Roman Emperor / Isabella of England (F15145)
m. 20 Jul 1235Heinrich VI, Holy Roman Emperor (1165-1197) 
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Constance of Sicily ( -1198)
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| John, King of England (1166-1216)
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| Isabel of Angoulême, Queen Consort of England (1188-1246)
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Henry III, King of England (1207-1272)  |
| Richard of Cornwall, King of the Romans (1209-1272) |
| Joan of England (1210-1238) |
| Eleanor of England (1215-1275) |
| Isabella of England (1214-1241)
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| Friedrich II, Holy Roman Emperor (1194-1250)
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| Margarethe von Hohenstaufen (1237-1270) |