Nielsen Hayden genealogy
Family: Adam de Newmarch / Agnes Fitzwilliam (F11175)
Robert de Newmarch ( -1352) 
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| William fitz William ( -1339)
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Isabel Deincourt ( -1348)
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John Fitzwilliam ( -1349)  |
| Adam de Newmarch ( -1344)
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| Robert de Newmarch (1344- ) |