It emerged as a "Triple Alliance" between the Alcohua, Tepanec, and a third group that ruled its capital city.
This empire's late period included the slaughter of most of its unarmed upper-class in the Massacre in the Main Temple. Proto-ethnographer Bernardino de Sagahun chronicled the history, beliefs, and culture of this empire in the Florentine Codex. It emerged as a "Triple Alliance" between the Alcohua, Tepanec, and a third group that ruled its capital city. The "Noche Triste" occurred in the capital of this empire, which rounded up rival warriors in the Flower Wars. This civilization took as its capital a metropolis built on an island in Lake Texcoco. For 10 points, name this Tenochtitlan-based Mesoamerican empire whose last ruler, Montezuma II, fell to Hernan Cortes.
This empire's late period included the slaughter of most of its unarmed upper-class in the Massacre in the Main Temple.
the {Aztecs} [prompt on {Nahuatl}; prompt on {Mexica}]