Codex Borbonicus, p. 9, a Mexica calendar book painted around the time of the Spanish conquest.
Key myth
In the Legend of the Suns he descends to Mictlan to retrieve the bones of earlier humans and sheds blood on them to make the present people.
Where sources differ or caution applies. The story that Cortés was mistaken for Quetzalcoatl comes from post-conquest sources and is doubted by historians.
Deities in other traditions who share a theme with Quetzalcoatl: wisdom, writing and divination, sky, storm and thunder, creation and first beings. This is overlap in one area only.