A Sign Read as Divine Command

Colonial-era Nahua accounts frame the Mexica migration from Aztlan as a journey directed throughout by Huitzilopochtli, communicating through priests who carried a bundled image of the god and interpreted his instructions at each stage, a structure that cast the entire migration, and not only its endpoint, as an unfolding religious mandate rather than a simple search for available land. By the time the wandering Mexica reached the Valley of Mexico, the most desirable territory around Lake Texcoco was already held by longer-established, more powerful altepetl, leaving the newcomers to settle wherever they were tolerated, generally the least wanted ground.

The eagle perched on a nopal cactus, seen on a small, marshy, snake-infested island near the lake's western edge, was read by the Mexica priesthood as the specific sign Huitzilopochtli had promised, transforming what might otherwise have looked like settling for scraps into an act of fulfilled prophecy. This reading mattered enormously to later Mexica political theology: it let a people who arrived last and poorest among the valley's peoples claim that their capital's location had been chosen by their god rather than left to them by default, grounding Tenochtitlan's legitimacy in religious rather than merely circumstantial terms.