According to Aztec historiography, the Toltec Empire, Toltec Kingdom or Altepetl Tolteca was a political entity in Mexico. It existed through the classic and post classic periods of Mesoamerican chronology, but gained most of its power in the Post classic. During this time its sphere of influence reached as far away as the Yucatan Peninsula. Its core cities were Tula, Tulancingo, and Huapalcalco, the more distant cities under its control and influence were Chupícuaro, Chichen Itza, and Coba.