Sir Artegall and his faithful squire soon after see a maiden flee before two knights, but, before they can overtake her, they notice how a new-comer slays one pursuer while the other turns back. Urged by the maiden, Artegall kills the second persecutor, and only then discovers that the knight who first came to her rescue is Arthur. They two, by questioning the maid, learn she is a servant of Mercilla (another personification of Elizabeth), and that her mistress is sorely beset by the Soldan, to whom she has recently gone to carry a message. On her return, the poor maid was pursued by two Saracen knights, who were determined to secure her as a prize. Hearing this, Artegall proposes to assume the armor of one of the dead knights, and thus disguised to convey the maiden back to the Soldan's court. Arthur is to follow under pretence of ransoming the captive, knowing that his offer will be refused so insolently that he will have an excuse to challenge the Soldan. All this comes true, and thanks to his magic shield Arthur triumphs. The Soldan's wife, learning that her husband has succumbed, now proposes to take her revenge by slaying the captive maid, but Artegall defends her and drives the Soldan's wife into the forest, where she is transformed into a tiger! Arthur and Sir Artegall now gallantly offer to escort the maid home, although she warns them that Guyle lies in wait by the roadside, armed with hooks and a net to catch all travellers who pass his cave. But, thanks to the bravery, strength, and agility of Arthur, Artegall, and Talus, Guyle's might is broken, and the maid triumphantly leads the three victorious champions to Mercilla's castle. After passing through its magnificent halls, they are ushered by Awe and Order into the presence of the queen, whose transcendent beauty and surroundings are described at length. While the queen is seated on her throne, with the English lion at her feet, Duessa (Mary Queen of Scots) is brought before her and is proved guilty of countless crimes; but, although she evidently deserves death, Mercilla, too merciful to condemn her, sets her free. It is while sojourning at Mercilla's elegant court that Artegall and Arthur see two youths appear to inform the queen that their mother Belge, or Belgium, a widow with seventeen sons, has been deprived of twelve of her offspring by a three-headed monster, Gereones (the personification of Philip the Second of Spain, the ruler of three realms). This monster invariably delivers his captives into the hands of the Inquisition, by which they are sorely persecuted. Hearing this report, Arthur steps forward, offering to defend the widow and her children. Mercilla granting his request without demur, Arthur hurries away, only to find that Beige has been driven out of her last stronghold by a faithless steward (Alba). But, thanks to Arthur's efforts, this steward is summoned forth, defeated in battle, and the lady reinstated in her domain.