Olmillos de Sasamón

View of the town from the terrace of one of the castle towers

Olmillos de Sasamón is a town belonging to the municipality of Sasamón, in the province of Burgos in the Autonomous Community of Castilla y León, located in the region of Odra-Pisguerga. In Olmillos there are Celtiberian archaeological sites on the nearby hill of Castarreño, with vestiges of the ancient Segisama turmoga. Around the year 880 a repopulation took place after the Reconquista, almost at the same time as in nearby Castrojeriz and already during the Middle Ages it was one of the fundamental points on the Camino de Santiago, with two pilgrim hospitals.