Maria dies (we never see her in the opera). Fiesco now laments the death of his daughter. Simon begs Fiesco to forgive him. Fiesco does not tell him Maria has just died. He promises to forgive him only if Simon lets him have his granddaughter. Simon explains he cannot because the child has disappeared. He goes into Maria’s room and finds she is dead. The people sing happily because Simon is the new Doge.