The narrative follows a royal rupture after King Lisuarte angrily withdraws favour and challenges a band of knights, who reject his summons and find refuge on the Firm Island. Their leaders reconcile and prepare for war while counsellors urge restraint to avoid civil strife. A royal envoy delivers formal defiance, which the islanders temper with pride and measured reply; meanwhile Amadis receives visitors and participates in island trials such as the Arch of True Lovers. Subplots trace recovered lovers, a lady near childbirth, and Amadis learning of impending lineage, prompting private grief before he prepares to sail for Gaul.