Resumen:
The twelve battles of Arthur listed by the ninth-century Historia Brittonum have been an intractable problem. This paper gives an outline of discussion past and present, before offering some conclusions on where the conflicts were and what they imply for the historical Arthur and Northern history in the sixth century; for it seems that each of these engagements ( excepting Mount Badon) can be located in Northumberland or southern Scotland, with the implication that Arthur himself was a North Briton and specifically a Strathclyder