Nielsen Hayden genealogy
Family: Robert Ferrers / Joan Beaufort (F11054)
m. Bef 30 Sep 1390Robert de Ferrers (1350-1380) 
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Elizabeth le Boteler (1345-1411)
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| John of Gaunt (1340-1399)
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| Catherine de Roet (1350-1403)
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John Beaufort (1371-1410)  |
| Robert Ferrers (1372-1396)
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| Joan Beaufort (1379-1440)
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| Elizabeth Ferrers (1393-1434) |
| Mary Ferrers (1394-1458) |