John Castle (born 14 January 1940) 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 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.
Castle was born in Croydon, Surrey. He was educated at Brighton College and Trinity College, Dublin, and trained for the stage at the Royal Academy of Dramatic Art.
Castle's first appearance was as Westmoreland onstage in Henry V on 5 June 1964, at the Open Air, Regent's Park. His first Broadway theatre appearance was in February 1970, as Jos in the short-lived musical Georgy.
In 1967 he made his screen debut as the plotting Prince Geoffrey in the big-screen adaptation of The Lion in Winter. The role garnered him much praise and set him on his way as an in-demand supporting actor in London and Hollywood. The film also launched the film careers of Anthony Hopkins, Timothy Dalton and Nigel Terry.
Castle garnered strong reviews for his screen performances in Antony and Cleopatra and Man of La Mancha.
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