The larger of the two codices, where the most powerful ruler of the Tlachinollan Kingdom in Guerrero is depicted as a jaguar devouring a man and transforming into a god.
[1] The ruler, Quiyahuital Tecuhtli, satisfied conditions as a nahual, being a noble and born on the first day of the "Rain" calendar.
Along with the other manuscripts mentioned above, a broader history of present-day Guerrero is depicted through the Tlapa-Tlachniollan development under the Rain God and eventual Spanish conquest.
Present day material analysis conducted on the two codices supports the timeline depicted in the manuscripts.
Researchers in archaeological science detected gypsum and indigo fluorescence that corresponds with the types of dyes used in Mesoamerica, yet later portions of the codices also contained inorganic pigments commonly used in Europe during the second half of the sixteenth century.