Ruy is a young page serving under Prince Sancho, the son of King Fernando.
Rodrigo tries to save his grandson from being exposed as a traitor.
Fernando sends Sancho and a small army to Zaragoza to confront the King of Aragon; Ruy reveals to the King that Flaín tried to kill him; Fernando starts to investigate who betrayed him.
The Castile troops fight against the Aragonese; Fernando discovers who was conspiring against him.
Sancho and his troops return to León; Flaín still makes attempts to seize power.
After the assassination of Flaín, many point to Ruy as the culprit; in Leon, Urraca finds out that Jimena and Ruy are in love and schemes a plan to gain from this information.
Jaime Lorente
Rodrigo Díaz de Vivar
Alicia Sanz
Infanta Urraca
José Luis García-Pérez
Fernando I El Grande
Elia Galera
Sancha la Bella
Carlos Bardem
Conde de León