The Ramírez Codex, not to be confused with the Tovar Codex, is a post-conquest codex from the late 16th century entitled Relación del origen de los indios que hábitan esta Nueva España según sus Historias. The manuscript is named after the Mexican scholar José Fernando Ramírez, who discovered it in 1856 in the convent of San Francisco in Mexico City.

Diego Durán was a Dominican friar best known for his authorship of one of the earliest Western books on the history and culture of the Aztecs, The History of the Indies of New Spain, a book that was much criticised in his lifetime for helping the "heathen" maintain their culture.