[1] It is considered one of the cradles of Mesoamerican civilization due to the finding in 1984, of the "Chimalhuacán Man", whose remains are some 12,000 old.
The Chimalhuacán Altepetl was founded 1259 by three Tlatoanis (brothers) named Huauxomatl, Chalchiutlatonac and Tlatzcantecuhtli.
[2] Chimalhuacán had three main occupation epochs identified: Probably founded and originally occupied between 400 a 100 BCE.
There are two occupation stages reported, during the early (800 to 1000 CE) and late (1100 to 1521 CE) Postclassical Chimalhuacán registered events: Before the Netzahualcoyotl crowning as Texcoco Tlatoani, triple alliance troops from Mexico, went to Texcoco and accompanied Netzahualcoyotl, the Tenochtitlan Tlatoani traveled, via de Santa Martha plains, and upon arriving at Chimalhuacán decreed an amnesty for all villages, that belonging to Texcoco, fought against them siding with the Tepaneca, as was the case of Huexotla; the fourth Mexica Tlatoani Itzcoatl (1427–1440) offered pardon in exchange for their surrender, as otherwise allied troops would enter and take their city, Huexotla did not accept the offer and decided to fight, the battle was brief as, Itzcóatl successor, Moctezuma I (1440–1469) took their king prisoner and the troops surrendered shortly thereafter.
[4] According to the Institute Mexiquense investigator, Maximinio Quintero, Pleistocene (period ending approximately 12,000 years before present) mammoth and other animals remains have been found at Chimalhuacán, man-made lithic utensils, a pre-ceramic skeleton, the best complete and preserved of 38 recovered up to 1984; According to the researcher, it could be the oldest in Mexico.
[4] Chimalhuacán archaeological zone has a site museum, with pleistocene fauna exhibits, and other items.