Wikipedia
Colhuacan (altepetl)
Culhuacan or Cohuatlichan was one of the Nahuatl-speaking pre-Columbian city-states of the Valley of Mexico. According to tradition, Culhuacan was founded by the Toltecs under Mixcoatl and was the first Toltec city. The Nahuatl speakers agreed that Culhuacán was the first city to give its rulers the title of "speaker" ( tlatoani).