Corradino asks Aliprando what is wrong with him, and is told that he is lovesick, which is a disease with no cure. Aliprando leaves, and Corradino summons Isidoro, whom he suspects of bewitching him, from his prison. Isidoro, in fear of his life, has no idea what he is talking about, but, just when Corradino is about to have him torn into pieces, a contrite Matilde appears. Ginardo is to take Isidoro back to the dungeon, but the two of them hide in order to watch developments. The bemused Corradino succumbs to Matilde's wiles (Finale: "Ah! Capisco; non parlate" - "Ah! I understand, do not speak"), and falls at her feet just as Aliprando arrives to announce that Raimondo and his troops are on their way to rescue Edoardo. Corradino leaves to give orders to the guards, taking Matilde with him, as the others comment on his surrender to her.