According to legend, he was Britain's greatest King. His name was King Arthur. He led his Knights of the Round Table from Camelot, a vast, spectacular castle built on a hill, and was supposed to have bravely fought Anglo-Saxon invaders and united the country. But there's very little evidence he really existed. History wasn't written in the Dark Ages, an era said to have been ruled by barbarism and chaos. The only way to really prove he existed was to find something with his name on it, maybe even Excalibur or the remains of the Round Table. Maybe even Camelot itself.