Aztec

The lords of Tlatelolco were greatly angered over this and said, one to another, "These Aztecs believe that we are of an alien lineage. Do they not know that we are Aztecs like them[?]

(= los señores de Tlatelulco, recibieron mucho enojo y pesadumbre, y dixeron entre sí mesmos: estos mexicanos imaginan que nosotros somos de diferente generacion quellos; no saben que somo mexicanos) [1867 edition]

Although united culturally, the Aztecs thought of themselves in terms of their particular tribal affiliations: as Mexica, Tetzcoca, Culhua, Tepaneca, etc.