"Fifth Sun" offers a comprehensive history of the Aztecs based on indigenous texts written in the Nahuatl language. The book challenges conventional narratives derived from Spanish sources, presenting an insightful perspective on Aztec life, culture, and politics from the viewpoint of the Aztecs themselves. Through a detailed examination of these native texts, the book reconstructs the rich tapestry of a complex society, exploring its rise, its interactions with neighboring peoples, and its eventual confrontation with the Spanish conquistadors. This work provides a nuanced understanding of the Aztec civilization by highlighting their intellectual achievements, societal norms, and the internal and external challenges they faced.