Yenisei Kyrgyz
The Yenisei Kyrgyz (), were an ancient Turkic people who dwelled along the upper Yenisei River in the southern portion of the Minusinsk Depression from the 3rd century BCE to the 13th century CE. The heart of their homeland was the forested Tannu-Ola mountain range (known in ancient times as the Lao or Kogmen mountains), in modern-day Tuva, just north of Mongolia. The Sayan mountains were also included in their territory at different times. The Yenisei Kyrgyz Khaganate existed from 538 to 1219 CE; in 840, it took over the leadership of the Turkic Khaganate from the Uyghurs, expanding the state from the Yenisei territories into Central Asia and the Tarim Basin. History The Yenisei Kyrgyz correlated with Čaatas culture and may perhaps be correlated to the Tashtyk culture. Their endonym was variously transcribed in Chinese historical texts as Jiegu (結骨), Hegu (紇骨), Hegusi (紇扢斯), Hejiasi (紇戛斯), Hugu (護骨), Qigu (契骨), Juwu (居勿), and Xiajiasi (黠戛斯), but first appeared as Gekun (or Ko-kun; ) or Jiankun (or Chien-kun; ) in Records of the Grand Historian and Book of Han, respectively. Peter Golden reconstructs underlying *Qïrğïz < *Qïrqïz< *Qïrqïŕ and suggests a derivation from Old Turkic qïr 'gray' (horse color) plus