The Arthur Legend
Was there really a King Arthur who rose following the Roman departure from England? I don’t know. Does the location of Tintagel Castle coincide with an earlier fortification? I don’t know that either.
(Link) “Tintagel Castle was built in the early 13th century by Richard, 1st Earl of Cornwall — the younger brother of King Henry III of England and one of the wealthiest men in Europe. Lacking in any strategic value and constructed in a style that was purposefully out of date, Richard was deliberately bringing a lost legend to life.”