According to myth, the greatAztec capital of Tenochtitlan was founded at the place where one of Huitzilopochtli's priests saw an eagle perched upon a large nopal cactus.
Tenochtitlan was built on an island in ancient Lake Texcoco and was connected to the mainland by three long causeways.
Although the great majority of indigenous documents were systematically destroyed by the Spanish after their arrival, a series of indigenous histories, maps, genealogies, and religious documents exist that date to the time of the Conquest or the years immediately following it.