 In prehispanic times there were a number of migration waves into the area including the Pirinda, Nahua, Huetamo, Colima, Purépecha and other peoples.There are sites of formal settlements from all Mesoamerican period.Important sites include El Opeño and those in Curutarán, Tepalcatepec Apatzingán, Zinapécuaro and Coalcoman.