“I have seen him claiming to be the Reincarnation of King Arthur and I have seen Pictures of Him wearing a Crown and everything.”
I’m familiar with that, but at the same time, it doesn’t make someone “King of the druids”, either. In addition to which, Arthur was never described as a druid anywhere in the ancient writings. Just being the reincarnation of King Arthur doesn’t make someone king of the druids – a “title” which has no precedent in history either. There was, according to Caesar, an archdruid in Gaul, who was elected or, in some cases, the title may have been won in combat (something which I doubt, personally).