The Huns were a nomadic people who lived in Central Asia, the Caucasus, and Eastern Europe, between the 4th and 6th century AD. According to European tradition, they were first reported living east of the Volga River, in an area that was part of Scythia at the time; the Huns' arrival is associated with the migration westward of an Indo-Iranian people, the Alans. The Huns have often been considered a Turkic people, and sometimes associated with the Xiongnu. While in Europe, the Huns incorporated others, such as Goths, Slavs, and Alans.