He was born in Casdemiro, and joined the Benedictines at the age of 12, and had taken classes in Galicia, León, and Salamanca. He later taught theology and philosophy at the university of Oviedo, and died at Oviedo. Padre Feijoo studied in Salamanca, Spain, at the University of Oviedo, earning a professorship in theology. Feijoo was a prominent essayist for the Spanish, and his critiques, letters, and plays helped change the steadfast beliefs of many during the 18th century.