The Yenisei Kirghiz lived in the upper Yenisey River valley, central Siberia. Chinese sources of the 2nd century BCE and Muslim sources of the 7th–12th centuries CE describe the Kyrgyz as red-haired with fair complexion and green (blue) eyes. First appearing in Chinese "Records of the Grand Historian" as Gekun or Jiankun (鬲昆 or 隔昆), and later as part of the Tiele tribes, they came under the rule of the Göktürks and Uyghurs. Later Kyrgyzstan it was part of the Kushan empire during Buddhism.