Xionites, Chionites, or Chionitae (Middle Persian: Xiyōn or Hiyōn; Avestan: X́iiaona-; Sogdian xwn; Pahlavi Xyōn) were a nomadic people in the Central Asian regions of Transoxiana and Bactria.
The Xionites appear to be synonymous with the Huna peoples of the South Asian regions of classical/medieval India, and possibly also the Huns of European late antiquity, who were in turn connected onomastically to the Xiongnu in Chinese history.
The Kidarites, or Kidara Huns, were a dynasty that ruled Bactria and adjoining parts of Central Asia and India in the 4th and 5th centuries. The Kidarites belonged to a complex group of peoples known collectively in India as the Huna, and in Europe as the Chionites (from the Iranian names Xwn/Xyon), and may even be considered as identical to the Chionites. The 5th century Byzantine historian Priscus called them Kidarite Huns, or "Huns who are Kidarites". Chinese annals referred to them as the Ta Yüeh-chih, or Lesser Yüeh-chih. The Huna/Xionite tribes are often linked, albeit controversially, to the Huns who invaded Eastern Europe around the same period. They are entirely different from the Hephthalites, who replaced them about a century later.
The Kidarites were named after Kidara (Chinese: 寄多羅 Jiduoluo, MC: Kjie-ta-la) one of their main rulers. The Kidarites appear to have been a part of a Huna horde known in Latin sources as the "Kermichiones" (from the Iranian Karmir Xyon) or "Red Huna". The Kidarites established the first of four major Xionite/Huna states in Central Asia, followed by the Alchon, the Hephthalites and the Nezak.