Kutlug I Bilge Boyla Khagan, also known by his throne nameQutlugh Bilge Kül Qaghan (骨咄禄毗伽阙可汗,Gǔduōlù Píjiā Quē Kèhán), and in Chinese sources by the personal name ofYaoluoge Yibiaobi (藥羅葛逸标苾) was thekhagan of theUyghur Khaganate from 744 to 747.

His title was Külüg Boyla (Guli Peiluo - 骨力裴罗^[1]) during theSecond Turkic Khaganate. He was a son of Yaoluoge Hushu (traditional - 藥羅葛護輸; simplified - 药罗葛护输).^[2] His father was the chieftain of Yaglakar clan and made numerous raids intoTang China. In 727 he ambushedJiedushi Wang Junchuo (王君㚟) killing him and woundingNiu Xianke. He succeeded his father at some point after 727.^[3]

AfterBilge Qaghan of the Second Turkic Khaganate died, a factional struggle arose within the rulingAshina clan. An alliance ofBasmyls,Uyghurs andKarluks overthrew the Second Turkic Khaganate and in the spring of 745 and killedÖzmiş Khagan. At first, the Basmyl chief was elected a Kaghan titledEletmish Kaghan (742–744), but he was soon overthrown by the allies, who elected Kutlug Boyla as Kutlug Bilge Kaghan.

After coming to power in 744, Kutlug Bilge Khagan moved his court toOrdu-Baliq in theOrkhon valley. Kutlug Bilge Kaghan maintained an alliance withTang China. He was made Prince of Fengyi (奉义王) and Huairen Khagan (怀仁可汗).^[3]

In 745 the Uyghurs defeated the last Turkic KhaganBaimei Khagan (744–745), and Kutlug Bilge Kaghan ordered his head to be sent toChang'an, after which the Tang Emperor thanked him by entitling him "Supernumerary General-in-chief of Left Courageous Guard" (左骁卫员外大将军). For the next two years, the Uyghur power continuously expanded, although its control did not reach the size of the Turkic Khaganate.

He died in 747 and left his son Tay Bilge Tutuq as heir to throne, however his other sonBayanchur Khan killed him and usurped the throne. He had another son – Tun Bagha Tarkhan who later rose to be a khagan as well.

At first he proclaimed himself asTokuz Oghuz khagan (Chinese:九姓可汗;lit. 'Khagan of Nine Tribes'). Nine tribes includedToquz Oghuz (nine Oghuz tribes), which were the Khaganal clan/sub-tribe Yaglakar (simplified Chinese:药罗葛;traditional Chinese:藥羅葛;pinyin:Yàoluógé) and eight Uyghur clans/sub-tribes known in Chinese rendering:

1. Huduoge 胡咄葛
2. Guluowu 啒罗勿
3. Mogexiqi 貊歌息讫
4. A-Wudi 阿勿嘀
5. Gesa 葛萨
6. Huwasu 斛嗢素
7. Yaowuge 藥勿葛
8. Xiyawu 奚牙勿

According to Edwin Pulleybank sixTiele tribes in the confederation – Bugu (僕固), Hun (渾), Bayegu (拔野古), Tongluo (同羅), Sijie (思結) andQibi (契苾) – had an equal status with the Uyghurs (迴紇); the reducedBasmyls numbered eight sub-tribes, and theKarluks had three sub-tribes, thus the collective appellation Üç-Karluk (Three Karluks).^[4] Later the Abusi (阿布思) and Gulunwugu(si) (骨崙屋骨[思]) were also added^[5] (Tang Huiyao manuscript has 骨崙屋骨恐 Guluwugukong,^[6] yet Ulrich Theobald (2012) amends 恐 (kong) to 思 (si) & proposes that 屋骨思 transcribedOğuz^[7]). Basmyls and Karluks were defeated by the Jiu Xing and forcibly incorporated, had a lower status, and were staged as vanguard of the Uyghur army, thus bringing the total number of tribes to eleven.^[8]

According to Haneda (1957), Toquz Oğuz were the Yaglakar-led group of nine clans included in the Uyghur tribe.^[9] In contrast,Golden (1992) proposed that Toquz Oğuz consisted of a Uygur-led group comprising nine tribes: Bugu, Hun, Bayegu, Tongluo, Sijie, Qibi, A-Busi, Gulunwugusi and the Uyghur proper, which comprised the nine clans of Yaglakar, Huduoge, Guluowu, Mogexiqi, AWudi, Gesa, Huwasu, Yaowuge, and Xiyawu.^[10] The Shine Usu inscription mentioned that the Yaqlakar ruled over the On-Uyğur (Ten[-Tribes] Uyghur) and Toquz Oghuz (Nine[-Tribe] Oghuz).^[11] Meanwhile, noticing thatTang Huiyao called the nine groups, led by Yaglakar, "surname-tribes" (姓部xìngbù) while theOld Book of Tang andNew Book of Tang called the other nine groups, led by Uyghurs, "tribes" (部落bùluò), Japanese scholars Hashimoto, Katayama, and Senga propose that the Tang Huiyao's list contained the names of the Toquz Oghuz tribes proper, while each name in the two lists in the Books of Tang recorded each surname of each of nine subtribal chiefs.^[10][12]

• Yaglakar clan
• 747 deaths
• 8th-century monarchs in Asia
• Founding monarchs in Asia
• Tengrist monarchs
• Uyghur khagans

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• Year of birth unknown