The Mexican Empire of Old refers to the AZTEC Empire, which was a Mesoamerican empire that flourished in the 15th and 16th centuries. It was located in what is now central and southern Mexico and was one of the most powerful and influential empires in the Americas. The Aztecs were renowned for their advanced culture, art, architecture, and military prowess. They also developed a complex system of government and religion, and their capital city, Tenochtitlan, was one of the largest cities in the world at the time.