<P> The other text that seems to support the case for Arthur's historical existence is the 10th - century Annales Cambriae, which also link Arthur with the Battle of Badon . The Annales date this battle to 516--518, and also mention the Battle of Camlann, in which Arthur and Medraut (Mordred) were both killed, dated to 537--539 . These details have often been used to bolster confidence in the Historia's account and to confirm that Arthur really did fight at Badon . Problems have been identified, however, with using this source to support the Historia Brittonum's account . The latest research shows that the Annales Cambriae was based on a chronicle begun in the late 8th century in Wales . Additionally, the complex textual history of the Annales Cambriae precludes any certainty that the Arthurian annals were added to it even that early . They were more likely added at some point in the 10th century and may never have existed in any earlier set of annals . The Badon entry probably derived from the Historia Brittonum . </P> <P> This lack of convincing early evidence is the reason many recent historians exclude Arthur from their accounts of sub-Roman Britain . In the view of historian Thomas Charles - Edwards, "at this stage of the enquiry, one can only say that there may well have been an historical Arthur (but ...) the historian can as yet say nothing of value about him". These modern admissions of ignorance are a relatively recent trend; earlier generations of historians were less sceptical . The historian John Morris made the putative reign of Arthur the organising principle of his history of sub-Roman Britain and Ireland, The Age of Arthur (1973). Even so, he found little to say about an historical Arthur . </P> <P> Partly in reaction to such theories, another school of thought emerged which argued that Arthur had no historical existence at all . Morris's Age of Arthur prompted the archaeologist Nowell Myres to observe that "no figure on the borderline of history and mythology has wasted more of the historian's time". Gildas' 6th - century polemic De Excidio et Conquestu Britanniae (On the Ruin and Conquest of Britain), written within living memory of Badon, mentions the battle but does not mention Arthur . Arthur is not mentioned in the Anglo - Saxon Chronicle or named in any surviving manuscript written between 400 and 820 . He is absent from Bede's early - 8th - century Ecclesiastical History of the English People, another major early source for post-Roman history that mentions Badon . The historian David Dumville has written: "I think we can dispose of him (Arthur) quite briefly . He owes his place in our history books to a' no smoke without fire' school of thought...The fact of the matter is that there is no historical evidence about Arthur; we must reject him from our histories and, above all, from the titles of our books ." </P> <P> Some scholars argue that Arthur was originally a fictional hero of folklore--or even a half - forgotten Celtic deity--who became credited with real deeds in the distant past . They cite parallels with figures such as the Kentish Hengist and Horsa, who may be totemic horse - gods that later became historicised . Bede ascribed to these legendary figures a historical role in the 5th - century Anglo - Saxon conquest of eastern Britain . It is not even certain that Arthur was considered a king in the early texts . Neither the Historia nor the Annales calls him "rex": the former calls him instead "dux bellorum" (leader of battles) and "miles" (soldier). </P>

When did the arthurian legends reach their height of popularity