Bernardino de Sahagún
Fray Bernardino de Sahagún collected extensive information on plants, animals, soil types, among other matters from native informants in Book 11, The Earthly Things, of the twelve-volume "General History of the Things of New Spain," known as the Florentine Codex, compiled in the third quarter of the sixteenth century. Bernardino de Sahagún reported the ritualistic use of Psilocybe mushrooms known to the Aztecs as "teōnanācatl" (agglutinative form of "teōtl" (god, sacred) and "nanācatl" (mushroom) in Náhuatl). An earlier work, the Badianus Manuscript or Libellus de Medicinalibus Indorum Herbis is another Aztec codex with written text and illustrations collected from the indigenous viewpoint. The ancient Aztecs used a variety of entheogens within their society.