Was King Arthur fact or fiction?
Unfortunately not. There is no proof that he ever existed. There is no place in history to place him. Did he wear full body armour, then he would have been around the middle ages, but all the Kings and Queens have been noted. Was he around earlier, then it would have to be after the Romans had left Britain, but again, all the Kings and Queens of that period have been noted. There might be a smidgen of fact, but he would more than likely have been a small King either in Cornwall or the South of Wales, as “Kings” were in charge of small areas, which eventually became Counties. It wasn’t until around the 10th Centuary that Britain was under one King. As for Merlin, sorry, but “magic” that was used by him does not exist. Thus….