http://en.wikipedia.org/wiki/Nahuatl
Often the term Nahuatl is used specifically with reference to
Classical Nahuatl, the administrative language of the Aztec empire.
The Aztecs were preceded by, and surrounded by, other Nahuatl-speaking
cultures, whose language certainly differed in some degree from
theirs. These include the Tepaneca, Acolhua, Tlaxcalteca, and
Xochimilca; and Nahuatl was perhaps one of the languages spoken in
Teotihuacan. As these groups became predominant, Nahuatl, and
especially Classical Nahuatl after the ascendancy of the Aztec empire,
was used as a lingua franca in much of Mesoamerica beginning from the
12th century AD until the 16th century, at which time its prominence
and influence were eclipsed by the Spanish conquest of Mexico.
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