The Tepanecs or Tepaneca are a Mesoamerican people who arrived in the Valley of Mexico in the late 12th or early 13th centuries. The Tepanec were a sister culture of the Aztecs (or Mexica) as well as the Acolhua and others—these tribes spoke the Nahuatl language and shared the same general pantheon, with local and tribal variations.
Reputedly welcomed to the Valley of Mexico by the semi-legendary Chichimeca ruler Xolotl, the Tepanecs settled on the west shores of Lake Texcoco. Under their tlatoani, Acolnahuacatl, the Tepanec took over Azcapotzalco from the indigenous inhabitants.
In the early 14th century, Tezozomoc brought the Tepanec to their height of power; at that point they controlled nearly all of the Valley of Mexico as well as parts of the Toluca and Morelos valleys. Native sources say that Tezozomoc lived to the age of over 100 and was legendary for his generalship and statesmanship.
- Santamarina Novillo, Carlos (2006). El sistema de dominación azteca. El Imperio Tepaneca. Fundación Universitaria Española, Madrid.
- Smith, Michael E. (1984). "The Aztlan Migrations of Nahuatl Chronicles: Myth or History?" (PDF online facsimile). Ethnohistory. Columbus, OH: American Society for Ethnohistory. 31 (3): 153–186. doi:10.2307/482619. ISSN 0014-1801. JSTOR 482619. OCLC 145142543.