King Arthur was a character in the 1998 film. He is one of the Knights of the Round Table and the main nemesis of Sir Ruber.
In the beginning of the film, where Ruber sneaks in and demands more land, Arthur refused to give it to him. Furious, Ruber pulled out a mace, struck Sir Lionel in the chest and killed him, and made a lunge for Arthur. He was eventually struck down by the magic sword Excalibur.