The twin cities of Tenochtitlan and Tlatelolco were probably larger than any other city in Europe.
The Aztecs conquered many neighboring city-states and established an empire called the Aztec Empire.
Religion and War in Aztec Society, which reached its height in the mid-1400s, were two of the factors that created the empire that is now Mexico.
The state religion of the Aztecs gave them an advantage over other groups in central Mexico and inspired them to conquer vast territories in a short time.
War was seen as a religious duty by nobles and occasional commoners, who gained prestige and wealth.
The Mexicas had a number of gods and goddesses that were both male and female.
Mexicas mixed their attributes with those of existing gods, like many polytheists.
The Mexica migrated into the central valley of Mexico from the north and established an empire.
The capital of the Aztec Empire was built on islands.
According to many accounts, victims were placed on a stone slab and their hearts were cut out with an obsidian knife, the priest then held the heart up as an offering to the sun.
The hummingbird god was a god of war and of young men, but in Tenochtitlan he was elevated to a god of war and of young men.
Estimates of how many people were sacrificed to the deity.
The work of Tlacaelel, the very long-lived chief adviser to and impossible to verify, appears to have been the cause of the change.
Both Mexica and later the emperors Itzcoatl and Montezuma I exaggerated the numbers.
Tlacaelel gained influence after the Mexicas defeated the Tepanecs in the 1420s, establishing new systems of dividing military spoils and each year.
The worship of Huitzilopochtli contributed to nomical calculations.
The Mexicas were guided to Lake 2.
Tlacaelel saw an eagle perched on a cac destroy older texts as he created this new Aztec tus, which a prophecy foretold would mark the site of their new city.
The Mexicas needed to provide a steady offering of human blood in order to keep the world alive.
One of the Aztecs' religious duties was human sacrifice.
The universe was thought to exist in a series of five suns.
The suns of the four previous ages had been destroyed, and the fifth sun, the age in which the Mexicas were now living, would also be destroyed unless the Mexicas fortified the sun with the energy found in blood.
New territory was brought under Mexica control by warfare, as well as providing victims to nourish the sun god.
Tlacaelel created a "mystico-militaristic" conception of Aztec destiny.
The Olmec and the Maya as wel as the Mexica practiced human sacrifice before the changes introduced by Tlacaelel, but the number of victims increased dramatically during the last period of Mexica rule.
The temple in the center of Tenochtitlan, dedicated to the water god Tlaloc, was expanded and renovated many times.
The priests sacrificed war captives for each expansion.
One of the deities venerated by Mexica and other groups was a young warrior-god named "Blue Hummingbird of the South".
If darkness was not to overtake the world, the sun had to be kept moving.
Aztecs believed the sun had to be fed with human blood to keep moving.