It opens with a lengthy description of a tournament at the court of Charlemagne, whither knights from all parts of the globe hasten to distinguish themselves in the lists. Chief among these foreign guests are Argalio and Angelica, son and daughter of the king of Cathay, with their escort of four huge giants. The prince is, moreover, fortunate possessor of a magic lance, one touch of which suffices to unhorse any opponent, while the princess, by means of an enchanted ring, can detect and frustrate any spell, or become invisible by putting it in her mouth. On arriving at Charlemagne's court, Argalio stipulates that all the knights he defeats shall belong to his sister, whom in return he offers as prize to any knight able to unhorse him. Such is the transcendent beauty of Angelica that Argalio is instantly challenged by Astolfo, who is defeated, and then by Ferrau, who, although defeated in the first onset, proves victor in the second, simply because he accidentally seizes the magic lance and directs it against its owner! Since the laws of the tournament award him the prize, Angelica, seeing she cannot otherwise escape, rides hastily away and conceals herself in the forest of Arden. She is, however, pursued thither by many knights who have been captivated by her beauty, among whom are Rinaldo (Renaud de Montauban) and Orlando, who were proposing to challenge her brother next. In the precincts of the forest where Angelica takes refuge are two magic fountains, one whose waters instantly transform love into hate, while the other induces any partaker to love the next person seen. Prowling around this forest, Rinaldo unsuspectingly quaffs the water which turns love to hate, so he immediately ceases his quest and falls asleep. Meantime Angelica, drinking from the other fountain and coming upon the sleeper, falls madly in love with him and watches for his awakening. But, still under the influence of the magic waters he has imbibed, Rinaldo rides away without heeding her timid wooing, and leaves her to mourn until she too falls asleep. Orlando, coming up by chance, is gazing in admiration upon this sleeping princess, when Ferrau rides up to claim her as his prize. These knights are fighting for her possession when the clash of their weapons awakens Angelica. Terrified she retreats into the thicket, and, thrusting her ring into her mouth, becomes invisible! Meantime the knights continue their duel until a messenger summons Ferrau to hasten to Spain, where war has broken out.