A statue of a Gallaecian warrior from the Castro Culture. Castro culture is the archaeological term for the Celtic culture of the north-western regions of the Iberian Peninsula (present-day northern Portugal together with Galicia, Asturias, Castile and León, Cantabria and Basque Country) from the end of the Bronze Age (c. 9th century BC) until it was subsumed by Roman culture (c. 1st century BC).