Ottone in villa (Otho at his villa, RV 729) is an opera in three acts by Antonio Vivaldi to an Italian libretto by Domenico Lalli (the pseudonym of Sebastiano Biancardi). It was Vivaldi's first opera and premiered on 17 May 1713 at the Teatro delle Grazie in Vicenza. Lalli's pastoral drama is set in ancient Rome and was a condensed adaptation of Francesco Maria Piccioli's satirical libretto for Carlo Pallavicino's opera Messalina (1679). However, Lalli changed several of the characters in Piccioli's libretto. Messalina became an invented character, Cleonilla. Emperor Claudius became another Roman emperor, Otho (Ottone), who had already appeared as a protagonist in Monteverdi's L'incoronazione di Poppea (1642) and in Handel's Agrippina (1709).