Guillaume of Jumièges names “Warinum et Fulconem, Robertum et Willelmum” as the four sons of “Willelmus Belesmensis, Yvonis filius...ex castro Alentio quod beneficio tenebat iure”, who was “crudelis et cupidus” as were all his sons. "Guillelmus de Belismo" founded the church of Saint-Léonard de Bellême by charter dated to [1023/27]. Guillaume of Jumièges records that “Willelmus Talvacius frater eius” succeeded after “Robertus Willelmi Belesmensis potestatis hæres et crudelitatis” was killed, adding that he was worse than his brothers in his crimes (“cunctis fratribus suis in omnibus flagitiis deterior fuit”).
Seigneur d'Alençon. Guillaume of Jumièges records that “Willelmus cognomento Talavatius” succeeded “Roberti fratris sui” with the help particularly of “Willelmi filii Geroii”. "…Willelmus filius Guillelmi…" witnessed the charter dated to [1042] under which Guillaume II Duke of Normandy donated "nostras insulas Serc et Aurrene, propter medietatem Grenere" to the abbey of Mont-Saint-Michel, supported by "Rannulfo filio Anschitilli". Orderic Vitalis records that “Willermus cognomento Talavicius Willermi Belesmensis filius” invited Guillaume Giroie to his marriage, where he was blinded, emasculated, and his ears cut off. Guillaume of Jumièges records that “Arnulfus...filius eius” [referring to Guillaume [II] “Talvas”] rebelled against his father whom he expelled and sent into exile. Guillaume of Jumièges records that “Willelmus Talavatius”, after he was exiled, arranged the marriage of “filiam suam...Mabiliam” to “Rogerium de Monte-Gummeri” who received him in his household. 1
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