Geoffrey also uses the character Gloiu, father of Vitalinus/Vitolinus, derived from Nennius. He names this character as a son of Claudius and appointed by his father as Duke of the Welsh. His predecessor as Duke is called Arvirargus. Assuming that Claudius and Arvirargus are supposed to be contemporaries, then this Claudius is the Roman emperor Claudius I (reigned 41–54). It seems unlikely that Claudius would have living grandsons in the 5th century, four centuries following his death. Reno suggests that Claudius II (reigned 268–270) would be a more likely "Claudius" to have living descendants in the 5th century.
geoffrey also uses the character gloiu father of vitalinus/vitolinus derived from nennius he names this character as a son of claudius and appointed by his father as duke of the welsh his predecessor as duke is called arvirargus assuming that claudius and arvirargus are supposed to be contemporaries then this claudius is the roman emperor claudius i (reigned 41–54) it seems unlikely that claudius would have living grandsons in the 5th century four centuries following his death reno suggests that claudius ii (reigned 268–270) would be a more likely "claudius" to have living descendants in the 5th century