Chronicle X comes from a hypothesis advanced by Robert Barlow in 1945 about the possible existence of an original source, written in Nahuatl, now lost, which should have been translated and served as the basis for the composition of a group of works from the 16th century which main subject is the history of the late postclassic Mexica people. The group of works associated with chronicle X are: Historia de las Indias de Nueva España e islas de la tierra firme by Fray Diego Durán, the Crónica mexicana by Hernando Alvarado Tezozómoc, the Códice Ramírez and the Manuscrito Tovar by the Jesuit Juan de Tovar, and the Historia natural y moral de las Indias by Father José de Acosta. Starting from a theoretical-methodological approach that combines t...