 The settlement started out independent but was first conquered by the Huexotzincas and remained subject to one dominion or another since.By the time of King Nezahualcoyotl, Acolman was an important town in the Texcoco dominion, after it was conquered by the Aztecs in 1396.The town was important because it was the only place in Mesoamerica that specialized in the breeding and raising of dogs (today known as the breed called xoloitzcuintli).