Nielsen Hayden genealogy
Family: William de Mirfield / Agnes de Beaumont (F22949)
m. Bef 1354
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John de Pontefract (1300-1346)
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| Robert de Beaumont ( -1329)
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Agnes de Quernby ( -1346)
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John de Beaumont ( -1360)  |
| William de Mirfield (1325-1380)
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| Adam de Mirfield (1360-1428) |