A funeral march is heard as Ernesto's knights enter followed by Adele and the ladies. All grieve over Ernesto's death at the hands of "a traitor, a vile pirate". Gualtiero, to the amazement of Ernesto's retainers, gives himself up to the knights and, as he is taken away, he prays that Imogene may forgive him ("Tu vedrai la sventurata" / "You will see the unhappy lady / whom I caused so many tears / and tell her if I wronged her / I also knew how to avenge her"). He believes his memory won't be hated forever ("Ma non fia sempre odiaia" / But it won't always be hated). She appears in a state of anguish and sees visions of her dead husband and her son ("Col sorriso d'innocenza ... Oh sole, ti vela di tenebre oscure" / "With the smile of innocence / with the glance of love / pray speak to your father of clemency and pardon"). Meanwhile, from the Council chamber, the Knights condemn Gualtiero to death and, as the scaffold is erected, Imogene is raving: (Finale: "Oh, sole! ti vela" / "Oh sun, veil yourself / in darkest gloom / hide the cruel axe / from my sight"). Her ladies lead Imogene from the courtyard.