The Tuqi King () was a high office of the Xiongnu, a title also known to the Chinese as "worthy/wise prince/king". In the 6th to 8th centuries, Chinese annalists used the expression 贤王 Xian wang only in reference to the Eastern Turkic Khaganate. The Tuqi King of the Left was generally designated as the successor of the chanyu. Two titles were awarded with each of them a commander-in-chief who derived his power from the eastern and western territories respectively. These served as two wings alongside the chanyu's main domain. The Chinese annalistic explanation was a "Worthy Prince of the Left (East)" and "Worthy Prince of the Right (West)". This organization of the state was traditional for the Eurasian nomadic states from the Huns to the Turkic Khanates. Etymology N.Ya. Bichurin, using the pronunciation of the Qing dynasty, phoneticized 屠耆 as (), which is a direct rendering of the Turkic "wise", making it a literal translation of the Chinese annalistic expression "wise prince"., However, Anna Dybo restored 屠耆's Western Han period's Old Chinese pronunciation as dā-grjəj, which traditional philologists interpret with some reservations as transcribing Turkic tegin "prince". Philologists also noted a close phonetical resemblance with another ancient Turkic title, togrul, which is homophonic with the Turkic word togrul "falcon". Other philologists interpret the dā-grjəj as representing Old Turkic , (< ), Turkish, Azeri, Turkmen, Gagauz doğru, Tuvinian , etc., all meaning "overt, honest, just". This interpretation had initially been suggested by Friedrich von Schlegel (1772–1829), and accepted by Kurakichi Shiratori and others as direct semantical and phonetical correspondence. Social function The Left Wise Prince belonged to the Chanyu clan, and in accordance with the lateral succession order, was an heir apparent to the reigning Chanyu; on the death of the reigning Chanyu, he was raised to the throne, and every member in the hierarchy of the Left Wing advanced one step up. Unlike the Left Wing, the members of the Right Wing belonged to the Khatun clan Huyan or later Xubu, were traditionally not eligible for the throne, and could be raised to the throne only as a result of a court coup. Accordingly, the Left Wise Prince commanded a larger contingent of the army, and during military actions in the absence of the Chanyu held a post of a Supreme Commander. Unlike the Right Wing Wise Prince, who held a position akin to a Supreme Judge and Prime Minister,