Nowell Myres would most likely view the idea of an Arthurian reign as key to the understanding of the history of sub-Roman Briton as A. invalid, because it presupposes the existence of a person who most likely never existed B. suspect, since it overlooks other factors important to an understanding of sub-Roman Briton C. plausible, to some degree, as there was some major historical figure who helped shaped the history of early Briton D. unsubstantiated by events described in the Annales Cambriae E. vital in determining the authenticity of the historical Arthur