Nielsen Hayden genealogy
Family: Geoffroi II de Mayenne / Constance of Brittany (F8109)
m. Abt 1135
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Juhel I de Mayenne ( -1161)
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Clemence de Ponthieu ( -1189)
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| Conan III of Brittany (1093-1148)
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Bertha of Brittany (1119-1162)  |
| Geoffroi II de Mayenne (1135-1165)
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| Constance of Brittany ( -1148)
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| Clémence de Mayenne ( -1189) |