They gradually in' reased their influence among other tribes, until, by union with the Toltecs, who occupied the tableland before them, they extended their empire to an area of from 18,000 to 20,000 square leagues.
Earliest of the Nahua nations, the Toltecs are traditionally related to have left their northern home of Huehuetlapallan in the 6th century; and there is other evidence of the real existence of the nation.
With the Toltecs is associated the tradition of Quetzalcoatl, a name which presentsitself in Mexican religion as that of a great deity, god of the air,.
After the Toltecs came the Chichimecs, whose name, derived from chici, dog, is applied to many rude tribes; they are said to have come from Amaquemecan under a king named Xolotl, names which being Aztec imply that the nation was Nahua; at any rate they appear afterwards as fusing with more cultured.
And in Salvador, furnish important material for the investigation of the obscure problems of the Toltecs and Olmecs, and of the extension of Maya peoples on the Atlantic coast of the Mexican Gulf from Campeche as far as Tabasco and Vera Cruz.