This document from the Database of Religious History details the religious practices of the Mexica (Aztec) civilization between 1325 and 1521 CE. It describes a complex religious system deeply interwoven with political power and societal structure, including a hierarchical priesthood, elaborate rituals, and a pantheon of deities. The text explores Mexica beliefs about the afterlife, human sacrifice, and supernatural beings, drawing extensively upon both print and online scholarly sources, as well as primary sources like the Florentine Codex. Significant attention is given to the religious group's social organization, institutions, and the costs associated with religious membership. Finally, the document also examines the Mexica calendar and their methods of food production.