Castillo de Olmillos de Sasamón

Spain, Spain

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Castillo de Olmillos de Sasamón is a 15th-century fortified palace located in the village of Olmillos de Sasamón, within Sasamón municipality in Burgos province, Castilla y León, Spain.

Built around 1440 by Don Pedro de Cartagena—a prominent converso aristocrat—as a luxurious noble residence rather than a military stronghold, it features elegant ashlar masonry, corner towers, and a residential layout reflecting the era's blend of defense and comfort for Castile's powerful families.

Retained by the Cartagena lineage through the late medieval period, this well-preserved Bien de Interés Cultural monument stands amid rolling plains near key Roman-era sites, symbolizing converso influence during Spain's turbulent feudal transition.