King arthur was supposed to have lived around: ad 500 ad 1070 500 bc 63 bc

King Arthur was supposed to have lived around 500 AD.

Explanation:

King Arthur is a prominent figure in European literature, especially English and French, in which he is represented as the ideal monarch in both war and peace. According to some late medieval juvenile texts, Arthur was a British-Roman king who led the defense of Great Britain against the Saxon invaders at the beginning of the 6th century. Its history belongs mainly to folklore and literature, but it has been suggested that Arthur could have been a real person or, at least, a legendary character based on a real person.

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