Nielsen Hayden genealogy
Family: Guillaume I de Fiennes / Agnès de Dammartin (F8192)
m. Bef 1 Jan 1204
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Enguerrand de Fiennes ( -1189)
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Sibyl of Boulogne ( -1208)
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| Aubrey II de Dammartin (1130-1200)
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| Mahaut of Clermont ( -1200)
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Juliane de Dammartin ( -1238)  |
| Simon II de Dammartin (1190-1239) |
| Agnès de Dammartin (1185-1245)
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| Guillaume I de Fiennes (1180- )
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| Enguerrand de Fiennes (1204-1269) |
| Mahaut de Fienes (1205- ) |