Bermúdez was born in
Asturias. He founded an art academy at
Seville, and was given responsibility to order the
Archivo General de Indias or the repository of documents relating to the Colonies. He later made secretary of the Council for Indian Affairs in Madrid, a post later lost. He put himself in the service of the statesman and author
Jovellanos and wrote his master's biography; Jovellanos then helped pay for his artistic studies and placed him in a government position. He is best known as the author of the Diccionario Historico, a biographical dictionary of the principal artists of Spain.
 He was also a friend of