A close-up of a statue that depicts King Arthur at Tintagel, a site associated with King Arthur that flourished between the fifth and seventh centuries in Cornwall, England. A sizable castle was built there in the 13th century. (Image credit: David Collingwood via Alamy)

Legend has it that King Arthur and the Knights of the Round Table were busy heroes, with tales of them slaying a giant, organizing a successful search for the Holy Grail , and ruling a kingdom from a city called Camelot .

Some stories say Arthur was conceived or born at Tintagel, a site in Cornwall, England, that flourished between the fifth and seventh centuries.…