Board Thread:Rewatching "Merlin" - Season Two/@comment-5102537-20130518184122/@comment-6905051-20130523100429

I think gaius caters mainly to the royal household and the central region of the castle, we hardly see him going far outside the castle and market surrounding it, so I suppose  He was the main established one in that zone; while rest of camelot, the parts outside the main castle also had lesser skilled physicians to cater to their need.

I don't think there were too many physicians lyin around those days, infact any sort of man of letter. And the few that were there were almost always courted and patronized by the rulers and therefore could be found in capital city/ near the castle.