This book demonstrates that the story of the returning god is a product of “fake news” uttered by Cortés. It does so by analysing the most important sources of the Quetzalcoatl-tale. A systematic context-enlargement that also includes ethnographic information and contemporary history reveals why and how Cortés constructed this story, and why and how the Aztec elite adopted it. This method proves to be an epistemological tool which allows researchers to identify pre-Hispanic information in ethnohistorical texts of colonial times. As a result, the true Quetzalcoatl behind the legend comes to light.