At first, the Kings of Navarre wanted to achieve an alliance with Castile by having Blanche marry Peter, eldest son and heir of King Alfonso XI.
In 1368, Bernal de Foix, the first Count of Medinaceli, took the side of the royal bastard Enrique II of Castile against his legitimate brother, King Peter of Castile.
The ruined castle on the hilltop above the town was the refuge for Peter of Castile after his defeat by the forces of Henry of Trastamara at the Battle of Montiel.
Geoffrey Chaucer visited Castile during Peter's reign and lamented the monarch's death in The Monk's Tale, part of The Canterbury Tales.
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As a result, he was the half-brother of the powerful Galician nobleman Fernando Ruiz de Castro, the Castilian queen Juana de Castro (wife of King Peter of Castile) and the controversial Inês de Castro, mistress and consort of King Peter I of Portugal.
He followed the parciality of King Peter of Castile against his brother Henry II of Castile, and for that reason passed to Portugal, at the time of King Ferdinand I of Portugal, also for following in Galicia, from where he held, his side in the pretension he had for the Crown of Castile against Henry II, the Bastard.