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Columbus' voyage is a success but a storm forces him to land on Portugal. The royals travel to Barcelona to sign a treaty with France, who ambitions to conquer Naples. The queen meets her new confessor, and her daughter ponders her future.

Columbus hides his doubts as he is pressed to make a second voyage. Portugal disputes the new lands to Castile, and France invades Italy. In Rome, the Pope juggles the rival countries interests for his own benefit.

Colombus has gone missing, and word travels back that his brothers are abusing the natives. Desperate to defeat the French, Isabel and Fernando must decide whether to use their children tools in their tactical negotiations.

Queen Isabel copes with loss on multiple levels, including Princess Juana's departure for Flanders to live with her husband.

Margarita arrives in Castile to marry Juan, a union that will bring equal parts joy and devastation.

A mere accident in the French court shakes the whole of Europe. Meanwhile, Juana's husband devises his own plan to assert his reign.

When Juana's situation with Felipe becomes desperate, her advisers urge her to return to Castile. Plus, relations with the Muslims in Granada reach a breaking point.

The succession of Castile and Aragon depends on Isabel's grandson. His disappearance unleashes the alarm and the only option is for the Courts to swear Juana and her husband as heirs. In Granada, not even Gonzalo can put down the revolt.

Renewed tensions with the French coincide with Felipe and Juana's visit there, putting their well-being at risk. And after many years, Juana finally returns to Castile.

As Juana is named the official heir of Aragon and Castile, Isabel and Fernando grapple with how to protect their reign against the influence of her husband, Felipe, especially in his allegiance to the French.

Felipe is sent to France to negotiate, while Aragon recuperates his army under this guise of diplomacy. Juana grows madder with the absence of her husband.

As Queen Isabel's health deteriorates, so does Juana's mental state, leaving the future of Castile's crown uncertain.

Queen Isabel's health shows no signs of improvement. Those in power continue to jockey for their place in a future Spain that may be forced to go on without her.