Xaltocan was a pre-Columbian city-state and island in the Valley of Mexico, located in the center of Lake Xaltocan, part of an interconnected shallow lake system which included Lake Texcoco. The site was originally settled by the Otomi people, but following a war in the late fourteenth century where the Otomi were defeated by an alliance of Tepanecs and Mexica the Otomi were driven off the island and relocated to Otumba, Metztitlan and Tlaxcala. The island of Xaltocan was then resettled by Nahuatl speakers.
Xaltocan is known to have been inhabited in the Postclassic period. Ceramics and other archaeological remains dating to this period have been recovered in excavations at the site. It is thought to have been a local center of power capable of exacting tribute from other city-states in the area.
The founding of Xaltocan is described in the mytho-historical documents, the Historia Tolteca-Chichimeca and Anales de Cuauhtitlan. According to the Anales the Xaltocameca (people of Xaltocan) were among the Chichimec tribes that left the mythical place of origin, Aztlán, under a leader named Quauhtliztac ("White Eagle"). The Historia also identifies the Xaltocameca as belong to the Otomi ethnic group. In this document, written by Ixtlilxochitl, the first leader of the Xaltocameca is named as Iztacquauhtli, which also means "White Eagle" in Nahuatl.
In the 13th century Xaltocan were involved in a prolonged war with the Nahua city-state of Cuauhtitlan. Xaltocan was initially the strongest but around 1395 the ruler of Cuauhtitlan, Xaltemoctzin, allied himself with Tezozomoc of Azcapotzalco and his subjects the Mexica of Tenochtitlan and finally managed to conquer Xaltocan. The Otomi inhabitants fled north to the Otomian city-state of Metztitlan and to Tlaxcala, while others were allowed to resettle on the lands of Texcoco in the place that was henceforth called Otumba - "Place of the Otomies".
During the next 100 years the site was resettled by Nahua peoples. After the Aztec Triple Alliance defeated the Tepanecs of Azcapotzalco, Xaltocan became an Aztec subject city and paid tribute to Tenochtitlan, mainly in the form of woven blankets.
- Davies, 1980 p. 233-34
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