the first to settle the area was the zacateca tribe located in what are now otlatlán and tenamitec around 583. in 1115, chichimecas related to xólotl, founder of texcoco, came to dominate the area. later the area would come under the control of the aztec empire. in the 12th century, olmeca, xicalancas, also nahuatl speakers, came into the area from tlaxcala, but were later displaced by the toltecs after the fall of tula. after this, there were other migrations of nahuatl speakers in the area.