The members of the harem sing of Giselda's luck in attracting the attentions of Oronte. As Giselda prays (Aria: Oh madre, dal cielo / "O mother, from heaven hear my lament") sudden shouts warn that the crusaders have invaded Antioch. Sofia rushes in to say that both Acciano and Oronte have been killed. Arvino enters with the hermit. Sofia identifies Arvino as the murderer of her husband and son. Giselda is horrified and recoils at her father's attempted embrace. She declares that this crusade was not the will of God. Arvino draws his sword and threatens to kill her for her blasphemy, but he is stopped by the hermit and Sofia. Arvino declares that his daughter has gone mad.
