Henry II King of England confirmed a donation to Savigny by "Ysabell filie Gualerandi comitis de Mellento", with the consent of "filiis suis Juhello…filio Gaufridi de Meduana, et Mauricio et Petro, filiis Mauricii de Creon", by charter dated to [Apr 1180/Jan 1183]. "Mauricius de Creon Hugonis filius" donated property to Roë by charter dated 23 Jun 1191, witnessed by "…Guillelmo de Guierchia et Isabel uxore mea et filiis meis Mauricio et Petro…". Her two marriages are confirmed by the undated charter by which her son "Mauritius dominus Credoni" confirmed the donation by "Constantia soror mea" of revenue set by "dominus Juhellus frater meus" at "apud Harperiam" to the abbey of Clarei, by undated charter, witnessed by "…domina Isabel matre mea, domina Gervasia…". "Mauritius de Credone filius Hugonis" appointed "meæ uxoris Isabel" as guardian of his lands and his children in his undated testament when leaving for Jerusalem. The Gesta Guillelmi Majoris Andegavensis Episcopi names “dominis de Credonio…et Isabella Domina de Credonio” among those present at the burial of Bishop Guillaume, undated but stated to be during the reign of Philippe II King of France. "Constancia soror domini Amaurici de Credone" donated property to Roë, with the consent of “...Isabel matris meæ et Juhel de Meduana et Amauricii de Credone fratrum meorum”, by charter dated 1217.
The Chronicon Savigniacensis Monasterii records the death in 1220 of "Juhellus de Meduana…domina Isabel mater eius".
The necrology of Angers Cathedral records the death "Kal Mai" of "Isabellis domina de Credonio". 1
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