A lot of history of Chihuahuas is a speculation and a theory. The facts tell us that Chihuahua is named after the Mexican State that borders Texas, Arizona, and New Mexico. It is believed that the breed descended from the breed Techichi, that lived in Mayan times (around the 5th century AD). The Toltecs (people that conquered the Mayans) were the first to domesticate the Techichi, they also used the dogs for religious purposes. Later the Aztecs became the ruling class of Mexico, they also had these dogs as companions and used them in religious ceremonies. This has been learned from the writings on tombs, temples, and pyramids. The remains of these small dogs were found in the state of Chihuahua in 1850 in old ruins of the palace, built by Emperor Montezuma I, near Casas Grandes. The remains of the Techichi indicate that the breed was long-haired and mute. After explorers had arrived in the New World, bringing their dogs alongside, the Techichi started mixing. The modern Chihuahua has gone through many changes. The American Kennel Club first registered the Chihuahua as a breed in 1904.