Aatzin.

an ancient Mexica lord who reached Tenochtitlan; he gave his daughter Xiuhcuetzin to Acamapichtli to help him produce a child when his wife Illancueitl could not (all according to Chimalpahin)

(central Mexico, seventeenth century)
Codex Chimalpahin: Society and Politics in Mexico Tenochtitlan, Tlatelolco, Culhuacan, and Other Nahuatl Altepetl in Central Mexico; The Nahuatl and Spanish Annals and Accounts Collected and Recorded by don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, eds. and transl. Arthur J. O. Anderson and Susan Schroeder (Norman: University of Oklahoma Press, 1997), vol. 2, 82–83.