In 1964, during an extensive archeological excavation of Teotihuacan, the disk was dug from the area directly in front of the famous Pyramid of the Sun, (the third-largest pyramid in the world) by a team of astonished archeologists. The discovery soon made international news and the sculpture was moved to the newly inaugurated National Museum of Anthropology, which had opened that year, to be displayed to the public.  

Archeologists believe the sculpture’s “halo” may allude to the setting and rising of the Sun, as the change from day into night was perceived by many Mesoamerican civilizations to be a cycle of the death and rebirth of the solar system. The symbolic meaning of the skull imagery itself is more difficult to identify, but it is thought that it may allude to the ritual practice of human sacrifice or be a representation of the Teotihuacan god of death, Mictlantecuhtli.