The Toltec Empire, Toltec Kingdom or Altepetl Tollan was a political entity in modern 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. The capital city of this empire was Tollan-Xicocotitlan, while other important cities included Tulancingo and Huapalcalco.