Nielsen Hayden genealogy
Family: Richard of Cornwall, King of the Romans / Isabel Marshal (F917)
m. 30 Mar 1231John, 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) |
| William Marshal (1146-1219)
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| Isabel de Clare (1173-1220)
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| Eve Marshal ( -1242) |
| Joan Marshal ( -1234) |
| Walter Marshal ( -1245) |
| William Marshal (1190-1231) |
| Maud Marshal (1192-1248) |
| Sybil Marshal (1204-1237) |
| Richard of Cornwall, King of the Romans (1209-1272)
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| Isabel Marshal (1200-1240)
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