Ferrando -- a novice priest -- has quite innocently fallen in love with Léonor, whose hand he accidentally touched during a religious service. He believes her such an angelic being that, as expressed in the famous aria "Era un angelo", he has placed her even above God within his heart. He abandons his religious vows in hopes of serving her. Knowing how dangerous it is for him to court her, she sends him away on a courtly mission: to fight the Moors as her knight. He returns, extraordinarily victorious: within but a single day, he has rallied the king's forces to overthrow "la luna" - "the crescent," i.e., Moslems - in Morocco and Granada. Alphonso heaps him with gifts, including the titles of Count of Zamora and Marquis of Montréal. However, Ferrando indicates that all he wants is Léonor, and with what might be taken as genuine generosity (for indeed the king has loved Léonor enough to wish to marry her himself could only he get rid of his wife...and he truly does wish to reward Ferrando for saving Spain's interests) Alphonso also commands the lovers be wed immediately. Léonora cannot rejoice, because she knows she is not worthy of Ferrando's love. And, via courtiers' intrigue, Ferrando indeed discovers the identity of his bride. Before the entire court, he condemns Alphonso for robbing him of his honor: in effect, every good deed that Ferrando had performed in battle, in Léonor's name, has been not only invalidated, but sullied -- by her position as Alphonso's mistress. He breaks his sword and throws the pieces at Alphonso's feet. (Although it easily slips by in the magnificent confrontational ensemble that concludes Act III, Ferrando's righteous anger is the one thing that truly shames and frightens the king, who realizes the young knight is in that moment his moral superior).