Aurelius Conanus or Aurelius Caninus was a Brittonic king in 6th-century sub-Roman Britain. The only certain historical record of him is in the writings of his contemporary Gildas, who excoriates him as a tyrant. However, he may be identified with one of the several similarly named figures active in Britain during this period. In the 12th century Geoffrey of Monmouth adapted Gildas' account for his chronicle Historia Regum Britanniae, and thereafter Aurelius Conanus was remembered as a legendary King of Britain.