A work of both consensus and innovation based upon extensive archaeological research, "Ancient Tula and the Toltec Heartland" studies Mesoamerica's problem city-Tula or Tollan, seat of the Toltec state. Along with Teotihuacan and Tenochtitlan, Tula was one of the most important prehispanic urban centers in Highland Central Mexico, reaching the height of its influence during the early Postclassic period between 900-1200 A.D.