How many movies have James Mason and John Gielgud acted in together?

They have worked on 5 movies together! Their first movie together was Julius Caesar (1953) while their highest rated movie together was Frankenstein: The True Story (1974). They have not worked together since The Shooting Party (1985). They are most known for their drama films together.

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Sir Randolph Nettleby
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Cornelius Cardew
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Dr. John H. Watson
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Prime Minister Lord Salisbury