iv.] It was generally understood to be the same land whence he and the Toltecs had come forth in ancient times; or if not actually the same, nevertheless, very similar to it.

While the myth refers to the latter as Tlapallan, it speaks of the former as Huey Tlapallan, Old Tlapallan, or the first Tlapallan.

But Old Tlapallan was usually located to the West, where the sun disappears at night;[1] while New Tlapallan, the goal of Quetzalcoatl's journey, was in the East, where the day-orb rises in the morning.

The relationship is obvious, and is based on the similarity of the morning and the evening skies, the heavens at sunset and at sunrise.
[Footnote 1: "Huitlapalan, que es la que al presente llaman de Cortes, que por parecer vermeja le pusieron el nombre referido." Alva Ixtlilxochitl, _Historia Chichimeca_, Cap.

ii.] In his capacity as master of arts, and, at the same time, ruler of the underground realm, in other words, as representing in his absence the Sun at night, he was supposed to preside over the schools where the youth were shut up and severely trained in ascetic lives, previous to coming forth into the world.