The Historia Pontificum et Comitum Engolismensis names "Guillermus filius eius primogenitus, dictus Sector-ferri" when recording that he succeeded "Fulconi…Engolismensi Comiti". "Fulco Engolismensium comes" donated property to Saint-Amant-de-Boixe with the consent of "Condoha comitissa uxore mea, filiisque meis Guillelmo…ac Gaufrido atque Fulcone" by charter dated to [1076/87].
He succeeded his father in 1087 as Comte d'Angoulême. "Willelmus Talefer comes Engolismensis et Vulgrinnus filius meus" donated property to Saint-Pierre d'Angoulême by charter dated to [1089/1101]. "Wilelmus…Talafers Engolismensis comes nepos [Willelmi Engolismensis] episcopi" restored property to Saint-Pierre d'Angoulême previously donated by his uncle, by charter dated to [1089/1101]. “Willelmus Engolismensis comes et filius eius Boucrinius...” are named as present in a charter dated 16 Dec 1094 under which Ramnulf Bishop of Saintes donated “ecclesias de Archiaco...Sancte Marie...Sancti Martini” to Saint-Pierre d’Archiac. “Willelmus Thaliafer comes Engolisme” donated “duabus silvis...in dominio...Borni atque alia...Chaus” to Baigne Saint-Etienne by charter dated to [1098/1107]. “Guillelmus comes Engolismensis” donated property to Saint-Pierre d’Archiac, with the consent of “filiis suis Bulgrimno et Raimundo”, by charter dated to [1098/1109] which also records that “Ademarus de Archiaco” donated property. A charter dated to [1101/09] records that “Domnus Ademarus Engolismensis episcopus” had donated “alodium...in terra de Fradorvilla”, which “Fulco comes Engolismensis frater sui” had granted him, to Baigne Saint-Etienne and that after the death of both of them “Willelmus Taliafer Fulconis comitis filius A. episcopi nepos, Engolismensem regens comitatum” confirmed the donation. The Historia Pontificum et Comitum Engolismensis records that Guillaume [V] Comte d’Angoulême, after returning from Jerusalem, fought "Ademarum Rupis-Fulcaudi dominum". "Willelmus agnomine Incisor-Ferri...Engolismensis comes" restored the church of Haimps [Aent] “in Sanctonensi pago...in castellania...Castri Mastacii” to Angoulême cathedral, naming “Fulchoni filio meo, cui castrum Mastacii me daturum disposueram” as guarantor, by charter dated 1108.
The Historia Pontificum et Comitum Engolismensis records the death of "Willelmus Taillefer Engolismensis Comes…apud Dusense Monasterium" and his burial in the same place. 2
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