The medieval Castillo de Portillo

The Castillo de Portillo is a medieval castle in Portillo, in the province of Valladolid, Castilla y León, Spain; the earliest elements of its present construction date to the fifteenth century.

The site, 23 km from Valladolid, has been fortified since the tenth century, when it is documented in connection with Moorish forays into the region. In the fourteenth century, and until the early fifteenth, it was in the possession of the family of Sandoval; in 1392 it was confiscated from Diego Gómez de Sandoval in the name of King Juan II of Castile. In 1464, the site was conferred upon Alfonso, held in trust by the prince's tutor, until his death in 1474, though it had been ceded to Rodrigo Alfonso de Pimentel, whose heirs held it until the nineteenth century.

The castle has been a national monument since 1931. It remains a property of the University of Valladolid.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons