King Arthur, also known as the Black Knight, is a character that appears in the Sonic the Hedgehog series. He was a being from the World of Camelot and was a magical illusion created by Merlin for the purpose of becoming a benevolent ruler over England. Under the guiding hand of his creator, Arthur achieved his purpose and became a legend. When he obtained the scabbard of Excalibur, however, he was corrupted by its power and became an evil tyrant who enslaved his kingdom. His reign of terror came to an end when Sonic the Hedgehog was called into the World of Camelot and slew him. Sonic himself was later hinted by Caliburn to be the true king.
(Source: Sonic Wiki Zone)
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