"Ever hear of King Arthur?"
Yes, the round table.
The "round table", Sir Lancelot, Sir Galahad etc. etc. etc. are the inventions of a much later age. The real King Arthur was not even called "king" in his own time. In the earliest known written references to him, he is called dux bellorum
, or, in modern English, a war-lord (literally, leader in battle in the original Latin). His main claim to fame is that his people fought the Germanic invaders (usually referred to as Anglo-Saxons) tooth and nail. He lost, of course, but that was largely due to overwhelming forces.