There a monster is about to devour him, when Angelica comes to his rescue.

But, even though she saves his life, he ungratefully refuses to return her affection, and abruptly leaves her to encounter other untoward adventures.

Meantime Orlando, still searching for Angelica, encounters a sorceress who gives him a magic draught which causes him to forget the past, and detains him a captive in the island of Dragontine.
Meanwhile the many knights enamoured with Angelica have gone to besiege her father's capital, but while they are thus employed she escapes from the city--thanks to her magic ring--and goes to deliver Orlando.

In return, he pledges himself to drive the besiegers away and save her father's capital, and on the way thither encounters Rinaldo, with whom, not knowing who he is, he fights two days, so equally are they matched in strength and skill.

The moment comes, however, when Orlando is on the point of slaying Rinaldo, and refrains only because Angelica opportunely reveals his opponent's name.
Still urged by Angelica, Orlando next hastens off to destroy the magic island and free its captives, who hurry back to France while their rescuer journeys to Cathay.