Tlalocan is also the first level of the upper worlds, or the Aztecs' Thirteen Heavens, that has four compartments according to the mythic cosmographies of the Nahuatl-speaking peoples of pre-Columbian central Mexico, noted particularly in Conquest-era accounts of Aztec mythology. To the Aztec there were thirteen levels of the Upper Worlds, and nine of the Underworld; in the conception of the Afterlife the manner of a person's death determined which of these layers would be their destination after dying. As the place of Tlaloc, 9th Lord of the Night, Tlalocan was also reckoned as the 9th level of the Underworld, which in the interpretation by Eduard Seler was the uppermost underworld in the east.