Meanwhile, Pietro confronts Mendoza, accusing him of treachery and adultery. Although Pietro threatens to kill him. Mendoza, knowing that Aurelia has not only been unfaithful with him, but also with the courtier Ferneze, shifts the Duke's attention, revealing Ferneze's treachery. He convinces the Duke to break into Aurelia's chambers; if he should find Ferneze there, and he attempts to flee, that should serve as proof of their adultery. For the most part, Mendoza's plan works, yet unbeknownst to him Ferneze is not killed but escapes, injured. The wounded Ferneze seeks out Altofronto, seeking aid and protection, both of which the former Duke provides.