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." At an island in Lake Texcoco, they saw an eagleholding a rattlesnake in its talons, perched on a nopal cactus. This vision fulfilled a prophecy telling them that they should found their new home on that spot. The Aztecs built their city ofTenochtitlan 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.