Question: The play on which the 1953 film directed by Joseph L. Mankiewicz was based on was believed to have been written in what year?
Sentence (from "Julius Caesar (1953 film)"): The film stars Marlon Brando as Mark Antony, James Mason as Brutus, John Gielgud as Cassius, Louis Calhern as Julius Caesar, Edmond O'Brien as Casca, Greer Garson as Calpurnia, and Deborah Kerr as Portia.
Relevant evidence: No