Nielsen Hayden genealogy
Family: Richard of Cornwall, King of the Romans / (Unknown mistress of Richard of Cornwall) (F16965)
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)  |
| Joan of England (1210-1238) |
| Isabella of England (1214-1241) |
| Eleanor of England (1215-1275) |
| Richard of Cornwall, King of the Romans (1209-1272)
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| Walter de Cornwall ( -1313) |
| Joan de Cornwall (1262-1316) |