Nielsen Hayden genealogy
Family: Constantine de Clifton / Margaret Howard (F11810)
m. Aft Feb 1390John de Clifton (1353-1388) 
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Elizabeth de Cromwell ( -1391)
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| Robert Howard ( -1388)
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| Margaret de Scales ( -1416)
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John Howard (1365-1436)  |
| Constantine de Clifton (1372-1396)
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| Margaret Howard ( -1434)
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| Elizabeth Clifton (1392-1461) |