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.

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Isabel visits Seville, Castile's richest city but also a place plagued by crime and corruption. Juan II accuses Fernando of caring more for his wife's kingdom than for his. A border incident sours relations between Castile and Granada.

Cabrera convinces the King to receive Isabel and Fernando in Segovia. Away from the Court, Pacheco offers Queen Juana his support while he plots to kidnap Isabel and her daughter.

Isabel and Fernando marry in Valladolid with the support of several nobles and are acclaimed by the people. However they are cousins and the marriage needs a Papal bull to be valid.

Reconciled, Fernando and a pregnant Isabel face their biggest test yet as the Portuguese invade Castile. King Alfonso marries Juana to reinforce her claim, but is reluctant to consummate the marriage as his supporters insist him to.

Just as the Granada War nears its end, Prince Juan's sudden illness threatens to give Isabel and Fernando's kingdoms to the Portuguese. Columbus retouches his plan, and Torquemada investigates a murder.

Fernando travels under disguise to meet Isabel in Valladolid, keeping an eye out for bandits and Pacheco's men. Isabel grows afraid as the time to sleep in the wedding bed comes near. Gonzalo can't hide his jealousy.

The King's long absence throws Portugal in confusion, but Isabel and Fernando are no less divided over their next move. Rome pressures Castile to adopt the Inquisition. In Granada, the jealous Aixa plots against the Emir.

The converts of Seville look at their options in the face of the Inquisition. Juana's unruliness threatens the peace between Portugal and Castile. Beatriz learns her nephew's secret. Muley-Hacén names his heir.

When Queen Juana is finally pregnant after 7 years of marriage, King Enrique IV orders that his half-siblings Isabel and Alfonso be brought from their home in Arevalo to the decadent Royal Court of Castile in Segovia.

Isabel and Fernando find refuge in Medina de Rioseco but their situation is dire. Pacheco's army is on the move, ready to punish their supporters. Fernando suspects of Carrillo, while news of her husband's infidelity drive Isabel mad.

The war bogs down as the nobles of Spain prefer to pursue their own interests before the Crown's, but a stroke of luck might tip the balance in the fight between Christians and Muslims. In Portugal, the king seeks to reinforce his position.

Fernando makes his authority in Aragon clear. Isabel receives a foreign sailor with a bold proposal. El Zagal rallies all Muslims to make common front against the Christians.

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Lead by Marquis Juan Pacheco and Archbishop Carrillo, several nobles rebel against the King under trumped-up charges. Enrique's supporters extort him to act, but he is unwilling to display violence.