The Qarluqs (Karluks) were a Turkish tribe that roamed the west of modern Mongolia and the north of modern Xinijang province from the 7th through the 13th century. The Qarluq federation consisted of three tribal groups (sanxing 三姓: Mouluo 謀落, Chisi 熾俟, and Tashili 踏實力) lead by a chieftain (yehu 葉護). First dominated by the Syr Tarduš the Qarluqs soon surrendered to the Tang empire that made the three chieftains overseers of area commands (dudufu 都督府). The Qarluqs lived among the Eastern Turks (Dong Tujue 東突厥) and often interferred in their political matters like in 742 when the Uighurs (Huigu 回鶻) and the Qarluqs supported the accession of Ashina Shi 阿史那施 as the Qaghan of the Eastern Turks. Only a few years later the Qarluqs declared their acceptance of the supreme rulership of the Uighur Qaghan Qutlugh Bilgä Köl (Guduolu Piqie Que Kehan 骨咄祿毗伽闕可汗). From the 760es on the Qarluqs became stronger and occupied the area formerly inhabited by the Türgiš ("Tuqishi 突騎施") and Western Turks. When the Uighur empire around Turfan (Gaochang 高昌) was overthrown in 840 many Uighurs were incorporated into the Qarluq federation. After the rise of the Karakhan Empire in the west, the Qarluqs had lost their power as a dominating federation.