After the assassination of Flaín, the Count of Leon, many point at Ruy as the culprit. Meanwhile, the one from Vivar is forced to go back to Zaragoza, where he was sentenced to death for having lain with Amina, the Emir’s daughter. In Leon, Urraca finds out that Jimena and Ruy are in love, and schemes a plan to gain benefit from this information.

Alfonso, following Urraca’s advice, has one last tempting card up his sleeve to get Ruy to stay in Leon by his side: breaking off Jimena’s betrothal to Orduño and blessing her marriage to Ruy. Ruy will get everything he wants, but in exchange he will have to betray Sancho. Meanwhile, the Arabs, who are looking to destabilize the Christian kingdoms, tell Sancha that the King was poisoned.

After Sancha’s death, the war between the three brothers is imminent. Sancho sets out to attack Galicia, but in order to do that he must pass through Leon. Alfonso can’t decide whether to leverage that moment and attack him or to let him through. Meanwhile, Ruy struggles with the passion between him and Amina, and the pain that Jimena’s betrothal to Orduño is causing him.

After Ruy’s decisive intervention in the battle, Sancho of Castile takes Galicia from his brother García. But this does not bring peace to the Iberian Peninsula. On the contrary: the final battle between Leon and Castile is approaching. Meanwhile, Ruy is forced to betray Amina.