Twelfth Night by William Shakespeare is set in the fictional land of Illyria. Duke Orsino loves Countess Olivia but she refuses his advances while mourning her brother. Meanwhile, Viola washes ashore after a shipwreck and disguises herself as a man named Cesario to serve Orsino. However, Olivia falls for Cesario. Elsewhere, Sir Toby, Maria and Sir Andrew plot against Malvolio, tricking him for their own amusement. Ultimately the true identities are revealed and the couples are united with Viola and Orsino and Olivia and Viola's twin brother Sebastian.