Caerleon

Caerleon has often been connected with King Arthur, because it is already mentioned in the early Welsh tales about the great king, but it has never been considered to be the location of Camelot1.

Modern archeological investigation showed that there once stood a Roman amphitheatre and that there stood a 6 th century building too.

But unfortunately there isn't any more evidence for Caerleon being the location. So it probably isn't.