John Castle is an English actor. Castle has acted in theatre, film and television. He is well known for his role as Postumus in the 1976 BBC television adaptation of I, Claudius and for playing Geoffrey II, Duke of Brittany, in the 1968 film, The Lion in Winter. He also played Dr. Carrasco as well as the prisoner called "The Duke" in the film Man of La Mancha, and the villain in RoboCop 3.
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