La Dori, overo Lo schiavo reggio (Doris, or The Royal Slave) is a tragi-comic opera in a prologue and three acts composed by Antonio Cesti to a libretto by Giovanni Filippo Apolloni. It was first performed in the court theatre at Innsbruck in 1657. The story is set in Babylon on the shores of the Euphrates and is a convoluted tale of mistaken identities—a female protagonist who disguised as a man eventually regains her lost lover, and a man disguised as a woman who causes another man to fall in love with him. In several respects it resembles the plot of Cesti and Apolloni's earlier opera L'Argia and foreshadows Apostolo Zeno's libretto for Gli inganni felici (1695) and Metastasio's libretto for L'Olimpiade (1733). The first Italian staging of La Dori was in Florence in 1661 for the wedding