Hamon was the son of Geoffroy III de Mayenne and Constance de Bretagne. The date and place of his birth have not been found.
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Geoffroy III de Mayenne |
Juhaël II de Mayenne |
Gautier de Mayenne |
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Alix de Beaugency |
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Clémence de Ponthieu |
Guillaume de Ponthieu |
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Adélaïde de Bourgogne Duché |
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Constance de Bretagne |
Conan III de Cornouaille |
Alain IV de Bretagne |
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Ermengarde d'Anjou |
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Mathilde Fitz Roy |
Henri I de Normandie |
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