Who played Elizabeth I in the 1939 film "The Private Lives of Elizabeth and Essex"?

"The Private Lives of Elizabeth and Essex" is a 1939 American historical romantic drama film directed by Michael Curtiz and starring Bette Davis, Errol Flynn, and Olivia de Havilland. Based on the play "Elizabeth the Queen" by Maxwell Anderson (which had a successful run on Broadway with Lynn Fontanne and Alfred Lunt in the lead roles) the film fictionalizes the historical relationship between Queen Elizabeth I and Robert Devereux, 2nd Earl of Essex.

The Earl of Essex (Errol Flynn) returns in triumph to London after having dealt the Spanish a crushing naval defeat at Cadiz. In London, an aging Queen Elizabeth (Bette Davis) awaits him with love, but also with fear, because of his popularity with the commoners and his consuming ambition.

Ruth Elizabeth "Bette" Davis (April 5, 1908 – October 6, 1989) was an American actress of film, television and theater. With a career spanning 60 years and 100 acting credits, she is regarded as one of the greatest actresses in Hollywood history. She was noted for playing unsympathetic, sardonic characters, and was famous for her performances in a range of film genres, from contemporary crime melodramas to historical films, suspense horror, and occasional comedies, although her greater successes were in romantic dramas.