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Nennius pushed the date of the battle of Mons Badonicus, to a later time, in AD 516. This was the first mention of Arthur in the historical (psuedo-historial) source. Then it was, that the magnanimous Arthur, with all the kings and military force of Britain, fought against the Saxons.
Arthur is a central figure in the legends making up the so-called Matter of Britain. The legendary Arthur developed as a figure of international interest largely through the popularity of Geoffrey of Monmouth 's fanciful and imaginative 12th-century Historia Regum Britanniae (History of the Kings of Britain).ne school of thought, citing entries in the Historia Brittonum (History of the Britons) and Annales Cambriae (Welsh Annals), sees Arthur as a genuine historical figure, a Romano-British leader who fought against the invading Anglo-Saxons some time in the late 5th to early 6th century.