The Chronicle of Adémar de Chabannes names "Bernardus" as son of "Willelmo".
He succeeded as Comte de Périgord. The Chronicle of Adémar de Chabannes records that "Lambertus vicecomes Martiliacensis et Arnaldus frater eius" were killed "a Bernardo" (clarified in a later passage as meaning Bernard, son of Guillaume Comte de Périgord) in revenge for "Santie sororis sue [Alduini]", without further explanation or detail regarding their offence against Sancha. The Chronicle of Adémar de Chabannes records that the testament of "Willelmus Sector ferri" was signed by "Bernardus comes, Arnoldus filius Bernardi…". "Bernardus…comes Petragoricensis" donated property to the monastery of Sarlat, with the consent of "uxore mea Garsinda", for the soul of "filiis et filiabus nostris…fratribus quoque nostris", by charter dated Jun [936/42], subscribed by "Guillelmi, Arnaldi, Gauberti, Bernardi, Ramnulphi, Alduini, Gaufredi, Heliæ, Amalgerii, Fulcherii, Oldolrici". "Guillelmus comes" donated property to the abbey of Saint-Cybard by charter dated after 942, subscribed by "Domni Guillelmi comitis et monachi, Bernardi comitis, Arnaldi filii sui, comitis, Odolrici vice comitis, Ademari vicecomitis…Ademari comitis filii Guillelmi".
He succeeded his cousin in [945] as BERNARD I Comte d'Angoulême. The Chronicle of Adémar de Chabannes records that "Bernardus comes" succeeded "Willelmus…Sector ferri" in Angoulême and that he and his sons ruled there for thirty years. "Bernardus comes" restored the abbey of Saint-Sour de Genouillac, with the consent of "uxore mea…Berta et filiis meis Guillelmo…atque Gausberto, seu Arnaldo, et Bernardo pariter", by undated charter. He, his wife Garsinde, and sons (in order) Bernard, Guillaume, Arnaud, Gausbert, Ramnulf, Hilduin and Geoffroy are named in his document dated to [936/42] describing his restoration of the monastery of Sarlat in Périgord. 1
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