Nielsen Hayden genealogy
Family: John Knyvet / Elizabeth Clifton (F11326)
m. Bef 1412John Knyvet (1358-1418) 
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Joan Botetourt ( -1417)
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| Constantine de Clifton (1372-1396)
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| Margaret Howard ( -1434)
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| John Knyvet (1394-1445)
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| Elizabeth Clifton (1392-1461)
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John Knyvet ( -1490)  |
| Margaret Knyvet (1412-1458) |