Many historical sources were lost with the destruction of Indigenous codices during the conquest. Although some chroniclers attempted to preserve pre-Hispanic cultural knowledge, the surviving documents mostly reflect the final stages before the Spanish arrival. The story told here presents what is currently known about the ancient peoples of Guerrero, drawing on various disciplines, such as linguistics. When combined with archaeological findings and physical anthropology, linguistic studies have helped identify the presence of specific human groups. While these sources may not offer exact dates, they do allow us to trace human migrations going back to very early times.