Twelfth Night is a romantic comedy by William Shakespeare. The play centres on the twins, Viola and Sebastian, who are separated in a shipwreck. Viola (who is disguised as Cesario) falls in love with the Duke Orsino, who in turn is in love with Countess Olivia. Upon meeting Viola, Countess Olivia falls in love with her thinking she is a man. the play addresses love, appearance and reality, and ambition.