He wrote on the history of Mexico and other neighboring nations in the Nahuatl and Spanish languages. The most important of his surviving works is the Relaciones or Anales. This Nahuatl work was compiled in the early seventeenth century, and is based on testimony from indigenous people.
In his historical writings, he covered Mexico's history and that of neighboring countries using both Nahuatl and Spanish languages. Among his surviving works is the Relaciones or Anales. This Nahuatl text was compiled in the early seventeenth century, based on information provided by indigenous individuals.