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)"): Julius Caesar is a 1953 epic Metro-Goldwyn-Mayer film adaptation of the play by Shakespeare, directed by Joseph L. Mankiewicz, who also wrote the uncredited screenplay, and produced by John Houseman.
Relevant evidence: Yes