"Fulco Andegavorum comes atque Hildegardis conjunx mea" founded the monastery of La Charité Sainte-Marie d’Anjou by undated charter signed by "…Goffridi Fulconis filii…". "Fulco Andecavorum comes et uxor mea Hildegardis filius quoque noster Goffridus" donated the bridge of Mayenne to the monastery of La Charité Sainte-Marie d’Anjou by undated charter.
She became a nun at the Abbey of Sainte-Marie de Ronceray which she had founded in 1028. “Fulco comes Andegavensis, Iherosolimitanum iter aggrediens cum Audeardi comitissa et filii suo Goffredo Martello” donated property “in Genio...molendinum atque furnum” by undated charter. "Hildegardis comitissa" relinquished rights in favour of the oratory of Toussaint by charter dated [21 Jun 1040/1 Apr 1046. "Joffredus Andecavorum comes…michi matronis domna Hildgalde comitissa genitrice mea simulque conjuge mea Agnosze" donated "curte Petre" to the monastery of La Charité Sainte-Marie d’Anjou by charter 1 Oct (no year).
She died while on pilgrimage to Jerusalem. An undated charter records the death of "comitissa Hildegardis quando viam Jerosolimitane peregrinationis" and her donation of serfs to the monastery of La Charité Sainte-Marie d’Anjou. The necrology of Angers Cathedral records the death "Kal Apr" of "Ildegardis nobilis comitissa". The Chronicæ Sancti Albini records the death "1046 Kal Apr" of "Hildegardis comitissa". A charter dated to [1060/67] recites a prior donation to Saint-Aubin d'Angers by "Hildegardis comitissa", who retained a life interest in the property which, after the death of the donor, was sold in turn to "Agneti comitissa" (recording her divorce from "comitum Gaufridum"), "comitem Gaufridum…Gaufridi nepotem" and finally "fratre eius Fulconi" who restituted it to the abbey. The necrology of Vendôme La Trinité records the death "Kal Apr" of "Hildegardis comitissa Andegavorum mater fundatoris nostri". The Chronicon Vindocinense records the death "Kal Apr" in 1046 of "Hildegardis religiosa comitissa Andegavensis". 1
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