"…Maino Alfridi filio…" signed the charter dated to before 1038 under which "Guarinus Redonensis episcopus" donated property to Marmoutier, confirmed by "Alanus comes". "Maino" donated property to Sainte-Trinité de Fougères with the consent of "Adelaida coniuge mea et Eudoni filio nostro" by undated charter which names "Mainonis avi mei…Alfridus genitor meus".
He succeeded his father as Seigneur de Fougères. "…Mainonis de Filgeriis…" witnessed the charter dated to [1055] under which Guillaume II Duke of Normandy donated property to the abbey of Marmoutier. The Chronique de Normandie, based on le Roman de Rou, names "le sire de Fougieres" among those who took part in the conquest of England in 1066.
He became a monk before he died, as shown by the undated charter under which "Radulfus Filogerensis et uxor eius Avicia" donated property to Sainte-Trinité de Fougères naming "pater eius Maino monachus sancti Martini apud Hilduini mansile…in comitatu comitis Moritonii". His date of death is suggested by the charter dated 1089 under which "Radulfus de Filgeriis" confirmed the donation by "Guillelmus" to Sainte-Trinité de Fougères recites an earlier donation by "Maino de Filgeriis". This is supported by the charter dated 1092 under which "Radulfus de Filgeriis" donated property to Sainte-Trinité de Fougères, which includes a certification by "W Moretoniensis comes" that "M de Filgeriis et R eius filius" had made a donation to the same abbey, indicating presumably that the 1092 donation was a confirmation. His place of burial is proved by the undated charter recording the foundation of Sainte-Trinité de Fougères which recites that "Adelaidis" was buried in the priory next to "maritum suum Mainonem et filium suum Judhalem".
Married Adelaide, daughter of ---. "Adelaida coniuge mea et Eudoni filio nostro" consented to the donation by "Maino" to Sainte-Trinité de Fougères by undated charter which names "Mainonis avi mei…Alfridus genitor meus". "Matris meæ Adeladis…" consented to the donation by "Radulfus seculari militiæ mancipatus" to Sainte-Trinité de Fougères by undated charter. She died after her husband, as shown by the evidence of the various charters cited here, but there is no indication of the date. An undated charter recording the foundation of Sainte-Trinité de Fougères recites that "Adelaidis" was buried in the priory next to "maritum suum Mainonem et filium suum Judhalem". 1
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