Chicomoztoc, “the place of the seven caves”

An Illustration from the Historia Tolteca Chichimeca, A post-Cortesian codex from 1550 written by the people of Cuauhtinchan to sustain their right to their lands under the Spanish Colonial authorities. They wrote their history from A.D. 116 through 1544 using a mixture of European and prehispanic styles.  

from Wikipedia

Nahuatl legends relate that six tribes lived in Chicomoztoc, or “the place of the seven caves”. Each cave represented a different Nahua group: the Xochimilca, Tlahuica, Acolhua, Tlaxcalan, Tepaneca, Chalca, and Mexica. Because of a common linguistic origin, those groups also are called “Nahuatlaca” (Nahua people). These tribes subsequently left the caves and settled “near” Aztlán, or Aztatlan.