Knight and ladies assemble and Montolino welcomes them, but Arturo is confused, then seeing Valdeburgo, he approaches him. Meanwhile, Alaide has entered and concealed herself. Valdeburgo tells Arturo that Alaide is present, but hidden. (Quartet: Arturo, Isoletta, Valdeburgo, and Alaide, aside). Isoletta greets Arturo who ignores her and remains in an anxious state, to the point where she realises that he does not love her and, essentially, releases him from his obligations. Then Alaide suddenly reveals herself, declaring that she has come to give Isoletta courage. As "La straniera", she begs Isoletta to continue with the wedding, and, taking the prospective bride and groom by the arm, begins to lead them into the church.