Codex Mendoza, p. 2r.
The opening of the Codex Mendoza depicts the founding of Tenochtitlan in 1325. The canals divide the city into four quarters which structure would survive the Conquest. In the center, the glyph for Tenochtitlan is as follows: a stone (tetl) with a prickly pear cactus (nochtli) on top, and the suffix "place" (tlan). The eagle perched on a cactus would later become part of Mexico's official seal.
S. Gruzinski, Painting the Conquest (Paris, 1992), p. 104.