Turtanu
"Turtanu" or "Turtan" (Akkadian: 𒌉𒋫𒉡 tur-ta-nu; Hebrew: תַּרְתָּן tartān; Greek: Θαρθαν; Latin: Tharthan; Syriac: ܬܵܪܬܵܢ tartan) is an Akkadian word/title meaning 'commander in chief' or 'prime minister'. In Assyria, the Turtanu ranked next to the king.
The Assyrian king would assign the individual who was turtanu to go to battle for him, thus giving great power and influence to the turtanu.
The office seems to have been duplicated, and there was a tartanu imni or 'tartan of the right', as well as a tartanu shumeli or 'tartan of the left'. In later times the title became territorial; we read of a tartan of 'Kummuh' (Commagene). The title is also applied to the commanders of foreign armies; thus Sargon speaks of the Tartan Musurai, or 'Egyptian Tartan'. The Tartan of 720 BC was probably called Ashur-iska-danin; in 694 BC, Abdai, and in 686 BC Bel-emurani, held the title. It does not seem to have been in use among the closely related Babylonians.