The Florentine Codex is divided by subject area into twelve books and includes over 2,000 illustrations drawn by Nahua artists in the sixteenth century. Book Twelve contains a meticulous retelling of the Spanish conquest of Mexico, from the days leading up to the first arrival of Cortes to the eventual submission of the Tlatilulcans, the Tenochtitlans, and their rulers to the Spaniards.