Was King Arthur really king of England?

No one is entirely sure if King Arthur really existed. There is potentially some element of truth in the story, but over the years it's been 'padded out' with adventures and things to make it a more interesting story.

For all we know, King Arthur may not have been royalty at all.

The historical basis for the Arthur legend lies in the 5th and 6th centuries when Roman Britain was fighting against the Anglo-Saxon invaders. Arthur, or his historical progenetor, would have been a British leader fighting against the Saxons. Thus he might have been called King of Britain but he was against the people who were not yet called English.

Evidence shows that King Arthur was real, but wasn't actually a king. He was just a peasant, a rebel. We all have just made up this fantastic story about him because he was a great man. Like J.F.K. Some people say J.F.K was really "king" Arthur reincarnated.