tarkhan

noun1

1. •
   (historical) An ancient Central Asian title used by various Turkic, Mongolic and Indo-European (Scythian and Tokharian) peoples, especially in the medieval era, and prominently among the successors of the Mongol Empire; it generally conferred exemption from taxation.

   • The tarkhan, leader of the Khazar army, meets Amram, Zelikman and a green-eyed young person who claims to be Alp, the brother of Filaq. — 2007