The legendary King Arthur of the Britons, may actually have been the real life Muirchertach mac Erca, High King (Ard Ri) of Ireland, and great-grandson of Niall Noígiallach (Niall of the Nine Hostages): http://www.thejournal.ie/was-king-arthur-an-irishman-206434-Aug2011/ http://oxfordindex.oup.com/view/10.1093/oi/authority.20110803100214836 http://childofdanu.blogspot.ca/2011/08/joys-of-local-journalism-or-how-i.html http://www.iamthetwinflame11-11.com/king-arthur-vs-muirchertach-erca.html