Adalgisa prays at the temple, remembering with some sorrow how she became involved with Pollione. He enters, telling her that she prays to a cruel god and is not trying to invoke the god of love. While she appears to reject him, he declares (Aria: "Va crudele" /"Go, O cruel one") but he is convinced that he cannot leave her; he is distraught, but she is equally torn, until the moment when he declares that he must return to Rome the following day. He begs Adalgisa to go with him: (Duet: Pollione, then Adalgisa, then together: "Vieni in Roma" / "Come to Rome"). She resists him, but finally appears to agree that they will leave together the following day.