Nielsen Hayden genealogy
Family: William de Grandison / Sibyl de Tregoz (F237)
m. Bef 1286
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Pierre de Grandison (1186-1258)
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Agnès de Neufchâtel (1207-1283)
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| John de Tregoz (1250-1300)
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| Mabel Fitzwarine ( -1297)
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Clarice de Tregoz ( -1289)  |
| William de Grandison (1250-1335)
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| Sibyl de Tregoz (1272-1334)
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| Mabel de Grandison ( -1351) |
| Katherine de Grandison ( -1349) |
| Agnes de Grandison ( -1348) |