Gonzalo de Berceo

Gonzalo de Berceo was a 13th-century Spanish poet and the first known author of verse in Castilian Spanish, celebrated for his religious works written in the Mester de Clerecía style. He served as a secular priest at the Benedictine monastery of San Millán de la Cogolla and authored notable texts including 'Milagros de Nuestra Señora' and hagiographies of saints like San Millán and Santa Oria.