However , Arthur does not appear in the Armes Prydain and other early prophetic works .
He is specifically indicated as fighting the Saxons in the 9th - century text Historia Brittonum and in works based on it .
Arthur does not appear in the Armes Prydain and other early prophetic works .
He is specifically indicated as fighting the Saxons in the 9th - century text Historia Brittonum and in works based on it .