 For instance, Quetzalcóatl, a deity of Mesoamerican culture who was also the putative leader of the pre-Aztec Toltec people, challenges traditional religious mythology and offers an original conception of divinity, the universe, and human nature. According to Quetzalcóatl, the supreme god is Ometéotl, the god of duality. Ometéotl was masculine and feminine, the creator of all things, and played an active role in all aspects of reality. However, since it is not clear whether Quetzalcóatl was a historical or mythical figure, it is also not clear what to make of the ideas that we normally attribute to him and which have been fundamental in the development of our understanding of Náhuatl philosophy.