Twelfth Night

Twelfth Night, or What You Will is a romantic comedy by William Shakespeare, believed to have been written around 1601–1602 as a Twelfth Night entertainment for the close of the Christmas season. The play centres on the twins Viola and Sebastian, who are separated in a shipwreck. Viola (disguised as a page named '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 expanded on the musical interludes and riotous disorder expected of the occasion, with plot elements drawn from Barnabe Rich's short story "Of Apollonius and Silla", based on a story by Matteo Bandello. The first documented public performance was on 2 February 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 comes ashore with a captain's help. She has lost contact with her twin brother, Sebastian, whom she believes has drowned. With the aid of the Captain she disguises herself as a young man named Cesario and enters the service of Duke Orsino. Orsino has convinced himself he is in love with Olivia who is in mourning and who therefore refuses to see entertainments, be in the company of men, or accept love or marriage proposals from anyone, including Orsino, until seven years have passed. Orsino then uses 'Cesario' as an intermediary to profess his passionate love for Olivia. But Olivia falls in love with 'Cesario', setting her at odds with her professed duty. Meanwhile, Viola has fallen in love with Orsino, creating a love triangle: Viola loves Orsino, Orsino loves Olivia, and Olivia loves Viola disguised as Cesario.

In the comic subplot, several characters conspire to make Olivia's pompous steward, Malvolio, believe that she has fallen for him. This involves Olivia's riotous uncle, Sir Toby Belch; another would-be suitor, the silly squire Sir Andrew Aguecheek; Olivia's servants Maria and Fabian; and Olivia's witty fool, Feste. Sir Toby and Sir Andrew engage themselves in drinking and revelry, disrupting the peace of Olivia's household until late into the night, prompting Malvolio to chastise them. Sir Toby famously retorts,

Maria suggests taking revenge on Malvolio by convincing him that Olivia is secretly in love with him. She forges a love letter, mimicking Olivia's handwriting, and plants it in the garden. The letter asks Malvolio to wear yellow stockings cross-gartered—a colour and fashion that Olivia hates, to be rude to the rest of the servants, and to smile constantly in Olivia's presence. Watched by Sir Toby, Sir Andrew, and Fabian, Malvolio finds the letter and is surprised and delighted. He starts following the letter's instructions to show Olivia his feelings. Olivia is shocked by the changes in him and, agreeing that he seems mad, leaves him to be cared for by his tormentors. Pretending that Malvolio is insane, the tormentors lock him in a dark chamber. Feste visits Malvolio to mock Malvolio's professed insanity, both as himself and disguised as a priest.

Meanwhile, Viola's twin, Sebastian, has been rescued by Antonio, a sea captain who previously fought Orsino, yet who accompanies Sebastian to Illyria, despite the danger, because of his admiration for Sebastian.

With their love for practical jokes, Sir Toby and Fabian convince Sir Andrew to challenge Cesario to a duel, knowing that neither of them can fight. Their initial duel is interrupted by Antonio, who believes Cesario to be Sebastian. Orsino's officers then arrest Antonio. Emboldened by this, Sir Andrew mistakes Sebastian for Cesario and slaps him, prompting Sebastian to beat up Sir Andrew. Olivia witnesses the skirmish and chastises Sir Toby, Sir Andrew, and Fabian. Taking Sebastian for 'Cesario', Olivia asks him to marry her, and they are secretly married in a church. Finally, when 'Cesario' and Sebastian appear in the presence of both Olivia and Orsino, there is more wonder and confusion at their physical similarity. At this point, Viola reveals her identity and is reunited with her brother.

Sebastian and Viola reunite, and the cases of mistaken identity are resolved. Orsino and Viola marry (Orsino to Viola: "But when in other habits you are seen, Orsino's mistress, and his fancy's queen"), and Antonio is released. Fabian confesses the plot against Malvolio, and reveals that Sir Toby has married Maria. Malvolio swears revenge on his tormentors and stalks off, but Orsino sends Fabian to placate him. The plays end with a song sung by Feste.