Ruy Díaz de Vivar is a Young page who loyally serves his master, Sancho, the future King of León and Castile. While he fights to come out on top in the Court thanks to his natural talent with a sword, he gets caught up in a conspiracy to overthrow the King, which would cause as much bloodshed, pain, and death in the Christian Kingdoms as it would in the Muslim taifas.

After the death of their father, Sancho, Alfonso, and García become kings of Castile, Leon, and Galicia, respectively. The disputes between them will turn the Iberian Peninsula into a battlefield. Ruy is knighted, and is getting closer and closer to achieving the dream his father never could. But, along the way, he will have to sacrifice what he loves most.