He was an investigator into survivals of the primitive rites and customs of the Peruvian Indians.
Fragments of his notes on the subject are preserved in the work of Pablo José Arriaga.
Avendaño's Sermones de los misterios de nuestra santa Fe católica were delivered in Quechua, and published alongside a Spanish translation in 1649 by the order of the Archbishop of Lima, Petro Villagomez.
This biographical article about a Peruvian religious figure is a stub.
You can help Wikipedia by expanding it.This article about a Catholic clergyman is a stub.