The site of a ruined ancient Mayan city in south-central Yucatán state, Mexico. Chichén Itzá was founded in about the 6th century AD, presumably by Mayan peoples of the Yucatán Peninsula who had occupied the region since Pre-Classic, or Formative, Period times (1500 BC-AD 300). The only source of water in the region is from wells (Mayan cenotes) formed by the collapse of portions of the limestone formation of the area. Two big cenotes on the site made it a suitable place for the city and gave it its name, from chi ("mouths") chen ("wells") and Itzá the name of the tribe that settled there. There are traces of early occupation at the site but the oldest surviving buildings are in the Puuc style of the 8th-early 10th centuries. In the 10th century after the collapse of the Maya cities of the southern lowlands Chichén Itzá was invaded - probably by the Toltecs. New buildings have their closest parallels at Tula and offerings thrown into the Sacred Cenote or Well of Sacrifice show widespread trade contacts. Chichén Itzá was the dominant power in Yucatan until about 1200 when it was superseded by Mayapán. At the center of the site is the Castillo or temple-Pyramid of Kulkulkan the Maya equivalent of Quetzacóatl; this is linked by a causeway to the nearby Sacred Cenote. Other major structures include the Temple of the Warriors (in front of which stands a Chacmool) large 'dance platforms' the Group of a Thousand Columns the Temple of the Jaguars and the largest Ball Court in Mesoamerica. Bas-relief carvings on a massive skull rack (tzompantli) shows the Ball Game to be associated with scenes of sacrifice. Relief carvings with themes of conquest and violence about and representations of Maya warriors submitting to Toltec warriors have been found on gold discs recovered from the Sacred Cenote.