The Huns were a nomadic tribe prominent in the 4th and 5th century CE whose origin is unknown but, most likely, they came from "somewhere between the eastern edge of the Altai Mountains and the Caspian Sea, roughly modern Kazakhstan." They are first mentioned in Roman sources by the historian Tacitus in 91 CE as living in the region around the Caspian Sea and, at this time, are not mentioned as any more of a threat to Rome than any other barbarian tribes. In time, this would change as the Huns became one of the primary contributors to the fall of the Roman Empire, as their invasions of the regions around the empire, which were particularly brutal, encouraged what is known as the Great Migration (also known as the "Wandering of the Nations") between roughly 376-476 CE. This migration of peoples, such as the Alans, Goths, and Vandals, disrupted the status quo of Roman society, and their various raids and insurrections weakened the empire.
