It was while screening this movie that agent Myron Selznick saw Vivien Leigh and decided that she was Scarlett O'Hara. Coincidentally, she was in Hollywood to accompany her lover and future husband, Sir Laurence Olivier, who was making Wuthering Heights (1939), and Selznick brought her down to the Gone with the Wind (1939) set where the burning of Atlanta was being shot, and introduced her to his brother David O. Selznick as his Scarlett O'Hara.
Vivien Leigh and Sir Laurence Olivier credit this movie as being the inspiration for their falling in love. Although both were married to other people, they became known as "the lovers" on the set.
Flora Robson reprised her role as Queen Elizabeth I in The Sea Hawk (1940), which also depicted the Spanish Armada.
This is the first of three films that paired Laurence Olivier and Vivien Leigh. The other two are 21 Days Together (1940) and That Hamilton Woman (1941).
In this movie, Vivien Leigh plays Cynthia, a servant of Queen Elizabeth I (Dame Flora Robson). In Caesar and Cleopatra (1945), Robson plays Ftatateeta, a servant of Queen Cleopatra (Leigh).