Twelfth Night, or What You Will is a comedy by William Shakespeare. The play centres on the twins Viola and Sebastian, who are separated in a shipwreck. Viola (who is disguised as a boy) falls in love with Duke Orsino, who in turn is in love with the Countess Olivia. Upon meeting Viola, Countess Olivia falls in love with her thinking she is a man. Illyria, the setting of Twelfth Night, is important to the play& apos; s romantic atmosphere. Illyria was an ancient region of the Western Balkans. Viola has fallen in love with the Duke Orsino, creating a love triangle between Duke Orsino, Olivia and Viola, being that Duke Orsino loves Olivia, Viola loves Duke Orsino, and Olivia loves Viola. Viola is not alone among Shakespeare& apos; s cross-dressing heroines; in Shakespeare& apos; s theatre, convention dictated that adolescent boys play the roles of female characters, creating humour in the multiplicity of disguise found in a female character who for a while pretended at masculinity. Her cross dressing enables Viola to fulfill usually male roles, such as acting as a messenger between Orsino and Olivia, as well as being Orsino& apos; s confidant.