From Medlands

http://fmg.ac/Projects/MedLands/NORMAN%20NOBILITY.htm

IVES de Bellême (-after [1031]).  "Avesgaudus…Cenomannensium presul, meusque frater Ivo" donated property to Saint-Vincent du Mans by charter dated to [995/1032][87].  "Rotberti filii Wilelmi, Ivo suus avunculus" donated property to Notre-Dame de Bellême by undated charter[88].  Abelin lists his donations of property at Le Mans to Marmoutier by charter dated [1064/10 May 1065], naming "Ivonis de Belismo [et] filiis illius Guilelmo, Avesgaudo præsule atque Ivone"[89].