“Aztlán” (from , ) is the ancestral home of the Aztec peoples. Astekah is the Nahuatl word for "people from Aztlan". Aztlan is mentioned in several ethnohistorical sources dating from the colonial period, and while they each cite varying lists of the different tribal groups who participated in the migration from Aztlan to central Mexico, the Mexica who went on to found Mexico-Tenochtitlan are mentioned in all of the accounts.
Historians have speculated about the possible location of Aztlan and tend to place it either in northwestern Mexico or the Southwestern United States, although whether Aztlan represents a real location or is purely mythological is a matter of debate.
Legends
Nahuatl histories relate that seven tribes lived in Chicomoztoc, or "the place of the seven caves". Each cave represented a different Nahua group: the Xochimilca, Tlahuica, Acolhua, Tlaxcalteca, Tepaneca, Chalca, and Mexica. Along with these people, the Olmec-Xicalanca and Xaltocamecas are also said to come from Aztlan. Because of their common linguistic origin, those groups are called collectively "Nahualteca" (Nahua people). These tribes subsequently left the caves and settled "near" Aztlán.
The various descriptions of Aztlán apparently contradict each other. While some legends describe Aztlán as a paradise, the Codex Aubin says that the Aztecs were subject to a tyrannical elite called the Azteca Chicomoztoca. Guided by their priest, the Aztec tribe fled. On the road, their god Huitzilopochtli forbade them to call themselves Azteca, telling them that they should be known as Mexica. Scholars of the 19th century—in particular Alexander von Humboldt and William H. Prescott—translated the word Azteca, as is shown in the Aubin Codex, to Aztec.
Some say that the southward migration began on May 24, 1064, CE, after the super nova Crab Nebula events from May to July 1054. Each of the seven groups is credited with founding a different major city-state in Central Mexico.
A 2004 translation of the Anales de Tlatelolco gives the only known date related to the exit from Aztlan; day-sign "4 Cuauhtli" (Four Eagle) of the year "1 Tecpatl" (Knife) or 1064–1065, and correlated to January 4, 1065.
Cristobal del Castillo mentions in his book "Fragmentos de la Obra General Sobre Historia de los Mexicanos", that the lake around the Aztlan island was called Metztliapan or "Lake of the moon." Another version reads:One day a man heard a bird calling to him, saying, "Go now, go now." When the man told the chief about the bird, the chief was relieved. He had known his people must find a new land, their own land, but had waited for a sign. So the people gathered and began a long march. They followed an idol of Huitzilopochtli that the priests carried. As they went, Huitzilopochtli spoke through the priests and prepared the people for the greatness of their empire to come. He explained that they should travel until they came to a large lake; there, they should look for another sign—an eagle in a cactus.
The journey took 200 years, and the people settled for a while in the Toltec capital of Tollan. Some people stayed in Tollan and some moved on. From time to time, Huitzilopochtli changed himself into a white eagle to inspire the people, and they traveled until they came to Lake Texcoco and saw a great eagle sitting on a cactus, holding a serpent. There they built Tenochtitlán, the city that became the capital and center of the Aztec empire.
Places postulated as Aztlán
Friar Diego Durán (c. 1537–1588), who chronicled the history of the Aztecs, wrote of Aztec emperor Moctezuma I's attempt to recover the history of the Mexica by congregating warriors and wise men on an expedition to locate Aztlán. According to Durán, the expedition was successful in finding a place that offered characteristics unique to Aztlán. However, his accounts were written shortly after the conquest of Tenochtitlan and before an accurate mapping of the American continent was made; therefore, he was unable to provide a precise location.
During the 1960s, Mexican intellectuals began to seriously speculate about the possibility that Mexcaltitán de Uribe was the mythical city of Aztlán. One of the first to consider Aztlán being linked to the Nayaritian island was historian Alfredo Chavero towards the end of the 19th century. Historical investigators after his death tested his proposition and considered it valid, among them Wigberto Jiménez Moreno. This hypothesis is still up for debate.
Some scholars even argue that it is nearly or completely impossible to find the true location of Aztlan. Conflicting accounts and narratives make the discovery extremely difficult and inaccurate.