The Historiæ Andegavensis, allegedly written by Foulques IV "Rechin" Comte d'Anjou, names his father as Goffridus ["Goffridus Grisagonella pater avi mei Fulconis"]. The Chronicle of Alberic de Trois-Fontaines names "Gaufridi Grisagonelli" as father of "Fulconis Andegavensum comitis". His parentage is confirmed by a charter dated 1037 which announces the birth in 1007 of ["Gaufridus Martellus
pater eius Fulcho
comes Andecavorum filius Gaufridi Fortissimi comitis qui cognominatus est Grisia Gonella"] and records donations to Saint-Aubin d'Angers. The Gesta Consulum Andegavorum and the Historia Comitum Andegavorum record that Count Foulques III "Nerra" was the son of Maurice, youngest son of Count Geoffroy I "Grisegonelle", which is chronologically impossible.
His mother is confirmed through various charters: "Adela" donated property to Saint-Aubin d'Angers by charter dated 6 Mar 974 which names ["seniore meo Gauzfredo comite"] and is subscribed by ["Gauzfredi comitis, Fulconis filii eius, Gauzfredi filii eius"]. ["Fulco Andegavorum comes atque Hildegardis conjunx mea"] founded the monastery of La Charité Sainte-Marie d´Anjou by undated charter signed by ["
Goffridi Fulconis filii
"]. [Fulco Andecavorum comes et uxor mea Hildegardis filius quoque noster Goffridus"] donated the bridge of Mayenne to the monastery of La Charité Sainte-Marie d´Anjou by undated charter.
Cawley: [ http://fmg.ac/Projects/MedLands/ANJOU,%20MAINE.htm#_Toc148525024