"Walterii de Meduana…[et] uxor eius Adelina et filius eorum Hamelinus…alter filius Juhellus" consented to a donation by "Ruellonius de Gorron, filius Gaufredi" of the church of Brecé to Marmoutier, by charter dated to [1099/1124]. "Radulfus Filgeriensis" with his wife Avitia donated property to the abbey of Holy Trinity, Savigny by charter dated 7 Mar 1113, subscribed by "…Hamelinus Meduanensis, Johellus frater eius". "Rotbertus miles de Sancto Dionisio" confirmed the donation of property to Mont-Saint-Michel by "pater meus Rotbertus Sancti Dionisii", agreeing to obtain the consent of "Hamelino de Meduana domino meo" by charter dated 1116, signed by "Juhellis fratris Hamelini Meduani".
He succeeded his brother in [1119] as Seigneur de Mayenne. The 1130 Pipe Roll records "Joheli de Meduana" in Middlesex.
Seigneur de Gorron d'Ambrières et de Châteauneuf 1135. "Juhellus Goualterii filius, dominus castelli Meduanæ…matre mea Adelina et sorore Felicia" organised the transfer of the monks of Saint-Martin to Mayenne castle, for the souls of "Gaufredi…avi mei et Gualterii patris mei…Hamelini fratris mei", by charter dated 1144, witnessed by "…Hugo de Lavalle…". The 1157 Pipe Roll records "Joheli de Maiena" in Somerset, and "Joheli de Maiena" (twice) under "Nova Placita & Nove Conventiones" in Devonshire. 1
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