fourth king of the Aztecs of Tenochtitlan and the first emperor
1390 CE
to 1440 CE
Itzcoatl ("Obsidian Serpent") is the fourth king of the Aztecs of Tenochtitlan and the first emperor, ruling from 1427 (or 1428) to 1440, the period when the Mexica throw off the domination of the Tepanecs and lay the foundations for the eventual Aztec Empire.