Yabgu
Encyclopedia
Yabgu was a state office in the early Turkic
Turkic peoples
The Turkic peoples are peoples residing in northern, central and western Asia, southern Siberia and northwestern China and parts of eastern Europe. They speak languages belonging to the Turkic language family. They share, to varying degrees, certain cultural traits and historical backgrounds...

 states, roughly equivalent to viceroy
Viceroy
A viceroy is a royal official who runs a country, colony, or province in the name of and as representative of the monarch. The term derives from the Latin prefix vice-, meaning "in the place of" and the French word roi, meaning king. A viceroy's province or larger territory is called a viceroyalty...

. The title carried autonomy in different degrees, and its links with the central authority of Kagan
Kagan
- People :* Daryn Kagan , former American newscaster* Donald Kagan , Yale historian specializing in ancient Greece* Elena Kagan, dean of Harvard Law School, U.S. Solicitor General , and Associate Justice of the U.S...

 varied from economical and political subordination to superficial political deference.

The position of Yabgu was traditionally given to the second highest member of a ruling clan (Ashina
Ashina
Ashina was a tribe and the ruling dynasty of the ancient Turks who rose to prominence in the mid-6th century when their leader, Bumin Khan, revolted against the Rouran...

), with the first member being the Kagan
Kagan
- People :* Daryn Kagan , former American newscaster* Donald Kagan , Yale historian specializing in ancient Greece* Elena Kagan, dean of Harvard Law School, U.S. Solicitor General , and Associate Justice of the U.S...

 himself. Frequently, Yabgu was a younger brother of the ruling Kagan, or a representative of the next generation, called Shad
Shad (prince)
Shad was a state office in the early Turkic states, roughly equivalent to governor. "Shad" could only be an appointee over a vassal tribe, where he represented interests of the preeminent Kagan. The name of this tribe was included in his title. For example, Tardu-shad could only be a Shad over...

 (blood prince). Mahmud Kashgari defined the title Yabgu as "position two steps below Kagan", listing heir apparent Shad a step above Yabgu.

As the centralized state disintegrated, the Yabgu was gaining more sovereignty, and historical records name a number of independent states with "Yabgu" being the title of the supreme ruler. One prominent example was the Oguz Yabgu state in Middle Asia, which was formed after the fragmentation of the Second Türkic Kaganate in the 840es. Another prominent example was the Karluk Yabgu, the head of the Karluk confederation which in the 766 occupied Suyab in the Jeti-su area, and eventually grew into a powerful Karakhanid state
Kara-Khanid Khanate
The Kara-Khanid Khanate was a confederation of Turkic tribes ruled by a dynasty known in literature as the Karakhanids or Ilek Khanids, . Both dynastic names represent titles with Kara Kağan being the most important Turkish title up till the end of the dynasty.The Khanate ruled Transoxania in...

.

Etymology

Although believed by some to be a derivation from early Turkic
Turkic languages
The Turkic languages constitute a language family of at least thirty five languages, spoken by Turkic peoples across a vast area from Eastern Europe and the Mediterranean to Siberia and Western China, and are considered to be part of the proposed Altaic language family.Turkic languages are spoken...

 davgu, other scholars believe that the word Yabgu is of Indo-European
Indo-European languages
The Indo-European languages are a family of several hundred related languages and dialects, including most major current languages of Europe, the Iranian plateau, and South Asia and also historically predominant in Anatolia...

 origin, and was perhaps borrowed by the Türks
Göktürks
The Göktürks or Kök Türks, were a nomadic confederation of peoples in medieval Inner Asia. Known in Chinese sources as 突厥 , the Göktürks under the leadership of Bumin Qaghan The Göktürks or Kök Türks, (Old Turkic: Türük or Kök Türük or Türük; Celestial Turks) were a nomadic confederation of...

 from the Kushan
Kushan Empire
The Kushan Empire originally formed in the early 1st century AD under Kujula Kadphises in the territories of ancient Bactria on either side of the middle course of the Oxus in what is now northern Afghanistan, Pakistan, and southern Tajikistan and Uzbekistan.During the 1st and early 2nd centuries...

 political tradition, preserved by the Hephtalites
Hephthalite
The Hephthalites or Hephthalite is a pre-Islamic Greek term for local Abdali Afghans, who's famous ruler was Nazak Abdali . Hephthalites were a Central Asian nomadic confederation of the AD 5th-6th centuries whose precise origins and composition remain obscure...

. Peter B. Golden points out that there is also the possibility that the leaders of the Göktürk Empire, the Ashina
Ashina
Ashina was a tribe and the ruling dynasty of the ancient Turks who rose to prominence in the mid-6th century when their leader, Bumin Khan, revolted against the Rouran...

, were themselves originally an Indo-European-speaking (possibly Iranian
Iranian peoples
The Iranian peoples are an Indo-European ethnic-linguistic group, consisting of the speakers of Iranian languages, a major branch of the Indo-European language family, as such forming a branch of Indo-European-speaking peoples...

) clan who later adopted Turkic, but inherited their original Indo-European titles. German Turkologist W.-E. Scharlipp writes that "a conspicuously large amount" of early Turkic titles are "in fact borrowings from Iranian
Iranian languages
The Iranian languages form a subfamily of the Indo-Iranian languages which in turn is a subgroup of Indo-European language family. They have been and are spoken by Iranian peoples....

"
, including "almost all of their titles". Carter V. Findley also notes that "many elements of Non-Turkic origin became part of Türk statecraft [...] and [are] ever since in common use in Turkish," while explaining that the name Ashina itself "probably comes from one of the Iranian languages of Central Asia."

Friedrich Hirth
Friedrich Hirth
Friedrich Hirth, Ph.D. was a German-American sinologist.-Biography:He was educated at the universities of Leipzig, Berlin, and Greifswald . He was in the Chinese maritime customs service from 1870 to 1897...

 suggested that the earliest title "Yabgu" was recorded in literary Chinese with regard to Kushan contexts with transliteration Xihou "e-khu (yephou)" . However, the Chinese does not make clear whether the title was the one bestowed on foreign leaders or rather a descriptive title indicating that they were allied, or united.

The Chinese word sihou (<*xiap-g’u) is a title. The second hieroglyph hou (sihou (<*xiap-g’u) corresponds to the title yavugo on the Kushan (Ch. Uechji) coins from Kabulistan, and yabgu of the ancient Türkic monuments [Hirth F. "Nachworte zur Inschrift des Tonjukuk" // ATIM, 2. Folge. StPb. 1899, p. 48-50]. This title is first of all a Kushan title, also deemed to be "true Tocharian" title. In the 11 BC the Chinese Han captured a Kushan from the Hunnu state, who was a "chancellor" (Ch. sijan) with the title yabgu (sihou). After four years he returned to the Hunnu shanyu, who gave him his former post of a «second [after Shanyu] person in the state", and retained the title yabgu (sihou). The bearer of this high title did not belong to the Hunnu dynastic line, well-known and described in detail in the sources. Probably, he was a member of the numerous Kushan (Uechji) autonomous diasporas in the Hunnu confederation. This history suggests, that in the Usun state Butszü-sihou, who saved the life of a baby Gunmo in the 160s BC, also was an yabgu.

According to Turkologist Mark Hubey, the name designated the supreme leader of the pre-Christian-era, or Hunnish (Ch. Xiongnu
Xiongnu
The Xiongnu were ancient nomadic-based people that formed a state or confederation north of the agriculture-based empire of the Han Dynasty. Most of the information on the Xiongnu comes from Chinese sources...

) confederation centered in the Mongolian steppes, and was rendered in Han Dynasty
Han Dynasty
The Han Dynasty was the second imperial dynasty of China, preceded by the Qin Dynasty and succeeded by the Three Kingdoms . It was founded by the rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han. It was briefly interrupted by the Xin Dynasty of the former regent Wang Mang...

 Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...

 as Chanyu
Chanyu
Chanyu , was the title used by the nomadic supreme rulers of Middle and Central Asia for 8 centuries, starting...

, as its Chinese pronunciation of the time was probably closed to "zham-gu".

It remains unclear whether the title indicates an alliance with the Chinese or simply with each other. A few scholars, such as Sims-Williams considered the Turkic "Yabgu" to be originally derived from the Chinese "Xihou".
Another theory postulates a Sogdian origin for both titles, "Yabgu" and "Shad". The rulers of some Sogdian principalities are known to have title "Ikhshid".
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