Codex Borbonicus, p. 9, a Mexica calendar book painted around the time of the Spanish conquest.
Key myth
A dual god, 'Lord and Lady of Duality', dwelling in the highest heaven in some accounts. In the Histoyre du Mechique, the pair have four sons: the red Tezcatlipoca, the black Tezcatlipoca, Quetzalcoatl and Huitzilopochtli.
Where sources differ or caution applies. Some modern scholars (notably Miguel León-Portilla) read Ometeotl as an abstract supreme deity; others think this overstates a sparse source base.