“[T]here is every probability that, although the historic scenes of many of the Arthurian exploits can be traced to the kingdom of Strathclyde or Cumbria, and the north of England generally, the poems celebrating them were chiefly framed in Armorica - the place of quiet retreat and refuge for the exiled Britons of our island - and that they thence came back to Britain itself, and also spread over the Courts of France and Germany in Norman-French.”