Sir Artegall, however, ruthlessly exposes the trick, whereupon the false Florimell vanishes, leaving nothing behind her save the wrongfully appropriated girdle, which reverts at last to its legitimate owner.
Seeing this, Braggadocchio is about to sneak away, when Sir Guyon suddenly steps forward demanding the return of his stolen steed.
Although Braggadocchio boldly asserts the steed he rides is his own, Sir Artegall inquires of each what secret tokens the animal bears, and thus enables Sir Guyon to prove ownership.
Sir Artegall, not long after leaving the marriage hall, journeys to the sea-shore, where he discovers twin brothers quarrelling for the possession of two girls, one of whom is perched upon a huge coffer.
Not only does Artegall check this fight, but, on inquiring into its cause, learns how the twin brothers were awarded neighboring islands, and how the storms and the sea have carried off half the land of the one only to add it to the possessions of the other.

Thus, one twin has become richer than the other, and the heiress, who had promised to marry the poorer brother, has transferred her affections and possessions to the richer twin.

On her way to join him, however, she suffers shipwreck and arrives at his island penniless.

But the chest containing her treasures is in due time washed back to the smaller island, where, meantime, the discarded fiancee of the richer brother has taken refuge.

As the wealthy twin declared, when the land was mentioned, that "what the sea brought he had a right to keep," Sir Artegall decides he shall now abide by his own words, and that, since the sea conveyed the treasure-chest to his brother, he has no further claim upon it.