Omeyocan is the highest of Thirteen Heavens in Aztec mythology, the dwelling place of Ometeotl, the dual god comprising Tonacatecuhtli and Tonacacihuatl.
There is some evidence that these two gods were considered aspects of a single being, as when a singer in Cantares Mexicanos asks where he can go given that "ōme ihcac yehhuān Dios" ("they, God, stand double"). The History of the Mexicans as Told by Their Paintings reports of the two that "se criaron sic y estuvieron siempre en el treceno cielo, de cuyo principio no se supo jamás, sino de su estada y creación, que fue en el treceno cielo" ( they created themselves and had always been in the thirteenth heaven; nothing was ever known of their beginning, just their dwelling and creation, which were in the thirteenth heaven). In the Florentine Codex, Sahagún relates that Aztec midwives would tell newborns after bathing them, "You were created in the place of duality, the place above the nine heavens. Your mother and father—Ōmetēcuhtli and Ōmecihuātl, the heavenly lady—formed you, created you."
A song from the Historia Tolteca-Chichimeca mentions "ay ōmeteōtl ya tēyōcoyani," literally "two-god, creator of humanity." Many scholars (most notably Miguel León-Portilla) interpret this name "Ōmeteōtl" as "Dual God" or "Lord of the Duality," seeing it as a fusion of Ōmetēcuhtli and Ōmecihuātl, existing primordially in Ōmeyōcān. León-Portilla further argues that Ometeotl was the supreme creator deity of the Aztecs, and that the Aztecs envisioned this deity as a mystical entity with a dual nature akin to the Christian concept of the trinity.
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