The Mixtecs , like many other Mesoamerican peoples , developed their own writing system .
Mixtecs ' codices that have survived are one of the best sources for knowledge about the pre-Hispanic culture of the Oaxacan region prior to the arrival of the Spaniards .
The Mixtecs , like many other Mesoamerican peoples , developed their own writing system , and their codices that have survived are one of the best sources for knowledge about the pre-Hispanic culture of the Oaxacan region prior to the arrival of the Spaniards .