Nielsen Hayden genealogy
Family: Robert fitz Roger / Margaret la Zouche (F2046)
m. 1265Roger fitz John (1220-1249) 
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Isabel of Dunbar ( -1270)
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| Alan la Zouche ( -1270)
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| Ellen de Quincy (1222-1296)
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Roger la Zouche (1241-1285)  |
| Oliver la Zouche (1250-1316) |
| Robert fitz Roger (1247-1310)
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| Margaret la Zouche (1251- )
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| John fitz Robert (1266-1332) |
| Euphemia de Clavering (1266-1320) |