Aztec mythology is the body or collection of myths of Aztec civilization of Central Mexico. The Aztecs were Nahuatl speaking groups living in central Mexico and much of their mythology is similar to that of other Mesoamerican cultures. According to legend, the various groups who were to become the Aztecs arrived from the north into the Anahuac valley around Lake Texcoco. The location of this valley and lake of destination is clear – it is the heart of modern Mexico City – but little can be known with certainty about the origin of the Aztec. There are different accounts of their origin. In the myth the ancestors of the Mexica/Aztec came from a place in the north called Aztlan, the last of seven nahuatlacas (Nahuatl-speaking tribes, from tlaca, "man") to make the journey southward, hence their name "Azteca." Other accounts cite their origin in Chicomoztoc, "the place of the seven caves," or at Tamoanchan (the legendary origin of all civilizations).
The Mexica/Aztec were said to be guided by their god Huitzilopochtli, meaning "Left-handed Hummingbird" or "Hummingbird from the South." When they arrived at an island in the lake, they saw an eagle which was perched on a nopal cactus full of its fruits (nochtli). This vision fulfilled a prophecy telling them that they should found their new home on that spot. The Aztecs built their city of Tenochtitlan on that site, building a great artificial island, which today is in the center of Mexico City. This legendary vision is pictured on the Coat of Arms of Mexico.
Creation myth 
According to legend, when the Mexicas arrived in the Anahuac valley around Lake Texcoco, they were considered by the other groups as the least civilized of all, but the Mexica/Aztec decided to learn, and they took all they could from other people, especially from the ancient Toltec (whom they seem to have partially confused with the more ancient civilization of Teotihuacan). To the Aztec, the Toltec were the originators of all culture; "Toltecayotl" was a synonym for culture. Aztec legends identify the Toltecs and the cult of Quetzalcoatl with the legendary city of Tollan, which they also identified with the more ancient Teotihuacan.
Because the Aztec adopted and combined several traditions with their own earlier traditions, they had several creation myths. One of these, the Five Suns describes four great ages preceding the present world, each of which ended in a catastrophe, and "were named in function of the force or divine element that violently put an end to each one of them". Coatlicue was the mother of Centzon Huitznahua ("Four Hundred Southerners"), her sons, and Coyolxauhqui, her daughter. She found a ball filled with feathers and placed it in her waistband, becoming pregnant with Huitzilpochtli. Her other children became suspicious as to the identity of the father and vowed to kill their mother. She gave birth on Mount Coatepec, pursued by her children, but the newborn Huitzilpochtli defeated most of his brothers, who became the stars. He also killed his half-sister Coyolxauhqui by tearing out her heart using a Xiuhcoatl (a blue snake) and throwing her body down the mountain. This was said to inspire the Aztecs to rip the hearts out of their victims and throw their bodies down the sides of the temple dedicated to Huitzilpochtli, who represents the sun chasing away the stars at dawn.
Our age (Nahui-Ollin), the fifth age, or fifth creation, began in the ancient city of Teotihuacan. According to the myth, all the gods had gathered to self-sacrifice themselves and create a new age. Although the world and the sun had already been created, it would only be through their sacrifice that the sun would be set into motion and time as well as history could begin. The handsomest and strongest of the gods, Tecuciztecatl, was supposed to sacrifice himself but when it came time to self-immolate, he could not jump into the fire. Instead, Nanahuatl the smallest and humblest of the gods, who was also covered in boils, sacrificed himself first and jumped into the flames. The sun was set into motion with his sacrifice and time began. Humiliated by Nanahuatl's sacrifice, Tecuciztecatl too leaped into the fire and became the moon.
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