"Twelfth Night, or, What You Will," is a comedy by William Shakespeare, believed to have been written around 1601–02 as a Twelfth Night's entertainmentfor the close of the Christmas season. The play expanded on the musical interludes and riotous disorder expected of the occasion, with plot elements drawn from the short story, "Of Apollonius and Silla," by Barnabe Rich, based on a story by Matteo Bandello. The first recorded performance was on February 2, 1602, at Candlemas, the formal end of Christmastide in the year's calendar. The play was not published until its inclusion in the 1623 First Folio. Viola is shipwrecked on the coast of Illyria and she comes ashore with the help of a captain. She loses contact with her twin brother, Sebastian, whom she believes to be dead. Disguising herself as a young man under the name Cesario, she enters the service of Duke Orsino through the help of the sea captain who rescues her. Orsino has convinced himself that he is in love with Olivia, whose father and brother have recently died, and who refuses to see any suitor until seven years have passed, the Duke included. Orsino then uses 'Cesario' as an intermediary to profess his passionate love before Olivia. Olivia however, falls in love with 'Cesario', as she does not realise 'he' is Viola in disguise. In the meantime, Viola has fallen in love with the Duke.