Vivian Leigh (1913 - 1967) in Caesar & Cleopatra, directed by Gabriel Pascal in 1945.

Shaw competes with Shakespeare's Antony and Cleopatra openly by recreating Cleopatra's earlier seduction of Julius Caesar when he came to Egypt. Leigh shared some of the sexual aggression of her role when she decided to break her own marriage and Olivier's in order to secure him as her husband. In this film she was still young enough to capture the allure of a youthful Cleopatra. Claude Rains played the aging Caesar.The correlation of the two plays was illustrated in 1951, when Laurence Olivier played Antony and Vivien Leigh Cleopatra in a production that played in repertory with George Bernard Shaw's Caesar and Cleopatra at the St James's Theatre and later on Broadway. Picture and some data courtesy of the Yorck Project, under Creative Commons Attribution-Share- Alike License (Wikipedia)