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Matlatzinco.

Headword: 
Matlatzinco.
Principal English Translation: 

the name for the Toluca valley; but another place with this name was just to the south of Quauhtinchan, along the Atoyac River, near the contemporary pueblo of San Juan Tzicatlacoyan in the state of Puebla; there is still a large archaeological zone there and a mountain named Matlatzin

(Quauhtinchan, sixteenth century)
Historia Tolteca-Chichimeca, eds. Paul Kirchhoff, Lina Odena Güemes, y Luis Reyes García (México: CISINAH, INAH-SEP, 1976), 220–221, note 2.

Orthographic Variants: 
Matlactzinco, Matlaqcingo