For some reason, the administrators got the wrong idea regarding my previous thread about this topic, erroneously thinking that it involved magic or legend.
The point is: archeologists discover the remains of Arthur, revealing that he indeed existed after all. Either as war leader or even as a king. Let's say he was indeed a king (they find a crown or inscriptions attesting that). What effect would it have on Great Britain? Let's go even further: after DNA testing, descendants of Arthur are discovered. What next?