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The characters of King Arthur, Queen Guinevere, Merlin, Sir Gawain, Sir Mordred, Lady Morgana, and Sir Kay are all major characters with origins in Arthurian legend. Also pulled from traditional lore are Camelot, the Knights of the Round Table, and Arthur's sword Excalibur. The general chivalric principles Camelot is famous for have been codified on this series as the New Order. In addition, the second-season episode "The Black Rose" features the characters of King Lot, King Uther, and Queen Igraine in a flashback episode that retells the famous "sword in the stone" legend.