In Shakespeare's Twelfth Night, the theme of love is prevalent throughout the play. This theme is explored through the various relationships and characters in the play, including the relationships between Olivia and Viola, Orsino and Viola, and Maria and Sir Toby.
Act I introduces us to Duke Orsino, who is infatuated with the Countess Olivia. Despite her refusal to receive his affections, Orsino persists in his pursuit of her. Meanwhile, Viola, disguised as a man under the name Cesario, has also caught the eye of Olivia. Viola, who is also in love with Orsino, is torn between her duty to serve him and her own feelings for him.
Act II brings the arrival of Sir Toby Belch, a drunken and mischievous character who is a friend of Olivia. He, along with the fool Feste and Maria, Olivia's maid, plot to trick the pompous Malvolio into believing that Olivia is in love with him. This prank ultimately leads to Malvolio's temporary confinement, causing tension within the household.
Act III sees the resolution of the love triangle between Orsino, Olivia, and Viola. Orsino, convinced that Olivia has fallen for Cesario, becomes jealous and angry. This leads to a confrontation between Orsino and Viola, in which she reveals her true identity as a woman. Orsino, realizing his love for Viola, asks her to marry him, to which she agrees.
Act IV brings the resolution of the prank against Malvolio, as well as the marriage of Sir Toby and Maria. The play ends with the various characters paired off and happily in love, concluding the central theme of love's triumph in Twelfth Night.
Overall, the theme of love is prevalent throughout the play, and is explored through the various relationships and characters. Through the ups and downs, love ultimately triumphs and brings happiness to the characters in Twelfth Night.