Eurasian nomads
Tarkhan was used among the Sogdian, Saka, Hephthalite, Turkic, and proto-Mongol peoples of Central Asia and by other Eurasian nomads. It was a high rank in the army of Timur. Tarkhans commanded military contingents (roughly of regimental size under the Turkic Khazars) and were, roughly speaking, generals. They could also be assigned as military governors of conquered regions.