Had you claimed to be any other hero I wouldn't have any trouble believing you; stories change, secrets are kept, and the true identities of heroes are often lost over time. Yeah, I would have believed if you had said you were anyone else.

But alright, since you told me your "name", then it's only fair I tell you mine: you are currently speaking to Arthur Pendragon, King of Knights, the boy who pulled the sword from the stone. In other words, "king of the Britons", wasn't it?