The Legend of King Arthur is a tale from medieval Britain about a noble king who led the Knights of the Round Table. Arthur is often depicted as the rightful ruler of Camelot, a mythical castle, and is associated with the magical sword Excalibur, which he pulled from a stone to prove his worthiness as king. The story includes various characters, such as Merlin, the wise wizard who guides Arthur, and Guinevere, his queen. Arthur's reign is marked by quests for honor and justice, but it ultimately ends in tragedy due to betrayal and conflict, leading to his mysterious disappearance.