The Yuezhi, or Rouzhi (Chinese: 月氏; pinyin: Yuèzhī or Ròuzhī; literally "Moon-clan"; Old Chinese: Tokwar), were an ancient Indo-European people. They are believed by most scholars to have been an Indo-European people and may have been the same as or closely related to the Tocharians (Τοχάριοι) of Classical sources. They were originally settled in the arid grasslands of the eastern Tarim Basin area, in what is today Xinjiang and western Gansu, in China, before they migrated to Transoxiana, Bactria and then northern South Asia, where they may have had a part in forming the Kushan Empire.
Read more about Yuezhi: Name, Origins, The Yuezhi Exodus, Settlement in Transoxiana, Invasion of Bactria, Expansion Into The Hindu-Kush, Foundation of The Kushan Empire, Fall of Kushan, Presumed Yuezhi Rulers