Where was King Arthur born?

The historicity of the Arthur of legend has long been debated by scholars. One school of thought believes that Arthur had no historical existence. Some hold that he originally was a half-forgotten Celtic deity that devolved into a personage (citing sometimes a supposed change of the sea-god Lir into King Lear). Supporters of this theory often link it to the Welsh etymology of Arthur's name as derived from 'bear', proposing bear gods named Artos or Artio (Proto-Celtic artos) as the precedent for the legend, but these particular deities are known to have been worshipped by the continental Celts, not the Britons.