Constance was the daughter of Conan III de Cornouaille and Mathilde Fitz Roy. The date and place of her birth have not been found.
She died in 1148. The place is not known.
Her husband was Geoffroy III de Mayenne. They were married, but the date and place have not been found. Their only known child was Hamon (?-?).
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Constance de Bretagne |
Conan III de Cornouaille |
Alain IV de Bretagne |
Hoël II Caignart |
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Havoise de Bretagne |
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Ermengarde d'Anjou |
Foulques IV d'Anjou |
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Hildegarde de Beaugency |
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Mathilde Fitz Roy |
Henri I de Normandie |
Guillaume de Normandie |
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Mathilde de Flandre |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 1148 |
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