 According to the "Cronica Mexicayotl", transcribed in 1609, in 1299, Culhuacan's "tlatoani", Coxcoxtli, helped the Tepanecs of Azcapotzalco, the Xochimilca and other cities expel the Mexica from Chapultepec.Coxcoxtli then gave the Mexica permission to settle in the barren land of Tizapan, southwest of Chapultepec, and they became vassals of Culhuacan.The Mexica subsequently assimilated into Culhuacan's culture and their soldiers provided mercenaries for its wars.