This manuscript was created between 1570 and 1589, either in the highland of Mexico or it may have already existed in Italy, similarly as in the case of the Paris Codex Telleriano Remensis; a copy of a joint original draft which Robert H. Barlow named the “Codex Huitzilopochtli”. While the Codex Telleriano Remensis clearly is written by several writers, the Codex Vaticanus 3738 contains only one style, however divided into cosmological, mythological and ethnographical sections. The hypothetically collected manuscript served as a draft for the final work and it is this fact without a doubt which accounts for the great value of this manuscript. The seemingly well-known author, Dominikaner Pedro de los Rios (who the Codex Rios is named after) is responsible for the Italian text from the original 101 folio European papers of the comprehensive manuscript Vaticanus.
We have 1 facsimile edition of the manuscript "Codex Vaticanus A (3738)": Codex Vaticanus A (3738) facsimile edition, published by Akademische Druck- u. Verlagsanstalt (ADEVA), 1979