Arturo burst out from inside the church, takes Alaide's hand, begging her to run off with him as he tries to drag her away. At that moment, the Prior rushes from the church and recognises Alaide as Queen Agnes. He announces that he has just learned that the Queen's rival for the throne, Isemberga, has died and now Alaide must return to Paris. Arturo, rendered mad by this news, throws himself on his sword and dies. Finally, La Straniera/Alaide/Agnes is in total despair. (Aria, then choral finale: "Or sei pago, o ciel tremendo... / Or vibrato è il colpo estremo" / "Now you are glutted, O fearful Heaven... / Now you have dealt your direst blow... I ask for death, I await death")