Exclusive: Finds suggest account in medieval folklore of a camp near Frenni Fawr hill was rooted in reality

Magnus Maximus, the Roman emperor who ruled Britain in the fourth century, led his troops against the Picts and Scots, but a theory that he also established a military camp near Frenni Fawr hill in Wales has so far been based on folklore.

Now fourth-century coins, among other finds at a newly identified Roman fort in Pembrokeshire, suggest the medieval tale was rooted in reality, to the excitement of archaeologists.