It’s the mid-11th Century. Ruy es a young man who has just been named squire to Prince Sancho, King Fernando of León’s eldest son. One night he discovers that someone he loves is involved in a conspiracy to overthrow the King. From then on, Ruy is caught between his loyalty to duty and to his heart.

Flaín is wants the man who upset the conspiracy. Rodrigo knows it was his grandson, which is why he intends to send him off to Vivar. On the other hand, Ruy resists leaving the King at the expense of Flaín, as he sees the only solution being to end the Count of León’s life. When it looks like everything is about to kick off, the Navarre troops turn up at the border and declare war against León.

Sancho has decided to execute his brother Alfonso and the rest of Leonese nobles who support him, including Orduño. As soon as Alfonso is dead, Sancho will be crowned King of Leon, and as a reward for his services, he offers Ruy the title of Count when Orduño is executed. He can finally get everything he has dreamed of: nobility, lands… and Jimena. But there is something Ruy isn’t counting on.