Among the best primary sources on Aztec culture, Aztec codices contain firsthand accounts of the civilization’s history and religion. While the pre-Colombian codices are largely pictorial, later colonial era codices contain Aztec pictograms, as well as Aztec, Spanish, and occasionally Latin writings. Though there are few surviving pre-conquest codices, the tradition endured the transition to colonial culture, and about 500 such works survive today. What massacre is described in the Aubin Codex? Discuss