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Mexica migration and foundation of Tenochtitlan

In the ethnohistorical sources from the colonial period, the Mexica themselves describe their arrival in the Valley of Mexico. The ethnonym Aztec (Nahuatl Aztecah) means "people from Aztlan ", Aztlan being a mythical place of origin toward the north. Hence the term applied to all those peoples who claimed to carry the heritage from this mythical place. The migration stories of the Mexica tribe tell how they traveled with other tribes, including the Tlaxcalteca, Tepaneca, and Acolhua, but that eventually their tribal deity Huitzilopochtli told them to split from the other Aztec tribes and take on the name "Mexica". At the time of their arrival, there were many Aztec city-states in the region. The most powerful were Colhuacan to the south and Azcapotzalco to the west. The Tepanecs of Azcapotzalco soon expelled the Mexica from Chapultepec and executed the first Aztec royal family except Queen Chimalxochitl II. In 1299, Colhuacan ruler Cocoxtli permitted them to settle in the empty barrens of Tizapan, where they were eventually assimilated into Culhuacan culture. The noble lineage of Colhuacan traced its roots back to the legendary city-state of Tula, and by marrying into Colhua families, the Mexica now appropriated this heritage. After living in Colhuacan, the Mexica were again expelled and were forced to move.

According to Aztec legend, in 1323, the Mexica were shown a vision of an eagle perched on a prickly pear cactus, eating a snake. The vision indicated the location where they were to build their settlement. The Mexica founded Tenochtitlan on a small swampy island in Lake Texcoco, the inland lake of the Basin of Mexico. The year of foundation is usually given as 1325. In 1376 the Mexica royal dynasty was founded when Acamapichtli, son of a Mexica father and a Colhua mother, was elected as the first Huey Tlatoani of Tenochtitlan.