Toltec
The Toltec culture was a pre-Columbian Mesoamerican culture that ruled a state centered in Tula, Hidalgo, Mexico, during the Epiclassic and the early Post-Classic period of Mesoamerican chronology, reaching prominence from 950 to 1150 CE. Wikipedia
Capital: Tula
Cause of collapse: Arrival of Chichimec peoples who conquered Tula
Dates: c. 950–1168
Geographical range: Mesoamerica (historically)
Language: Nahuatl, Otomi
Major sites: Tollan-Xicocotitlan (capital), Huapalcalco
Period: Mesoamerican Postclassic Period