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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.
Back in England at about the same time, (around 1200AD) the priest Layamon wrote the story in English-the first time it had appeared in this language. In his version Arthur did not die from his wounds, he remained on the Isle of Avalon-to return some time in the future.