Nielsen Hayden genealogy
Family: Robert de Willoughby / Margery la Zouche (F8481)
m. Bef 1 Oct 1369John de Willoughby (1329-1372) 
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Cecily de Ufford ( -1372)
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Joan de Willoughby ( -1404)  |
| William la Zouche (1321-1382)
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| Elizabeth de Roos ( -1380)
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| Robert de Willoughby (1348-1396)
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| Margery la Zouche ( -1391)
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| Thomas Willoughby ( -1417) |
| William Willoughby (1370-1409) |