Gonzalo de Berceo was a Castilian Spanish poet born in the Riojan village of Berceo, close to the major Benedictine monastery of San Millán de la Cogolla. He is celebrated for his poems on religious subjects, written in a style of verse which has been called Mester de Clerecía, shared with more secular productions such as the Libro de Alexandre, the Libro de Apolonio. He is considered the first Castilian poet known by name.