El Maestro Custodio is believed[by whom?]
to have been a 14th-century Benedictine monk living in the city of Oviedo in Asturias, Spain.
He is believed to have written a history of Asturias, now lost but cited by several later historians.
This biographical article about a Spanish historian is a stub.
You can help Wikipedia by expanding it.This Spanish history–related article is a stub.