The purchase of the sierra from the countess Historical milestone · Cobreros, Sanabria, Zamora In 1920 the residents bought from the countess of Benavente the sierra they had been using by custom, closing centuries of seigneurial dependence; in 1972 the municipality also absorbed the municipal district of Terroso. 1920 Photo: No machine-readable author provided. Jervert assumed (based on copyright claims). (CC BY-SA 2.5) What to see and do in Cobreros