Uyghurs
The history of the Uyghur people, as with the ethnic origin of the people, is a matter of contention between Uyghur nationalists and the Chinese authority. Uyghur historians viewed the Uyghurs as the original inhabitants of Xinjiang with a long history. Uyghur politician and historian Muhemmed Imin Bughra wrote in his book "A History of East Turkestan", stressing the Turkic aspects of his people, that the Turks have a 9000-year history, while historian Turghun Almas incorporated discoveries of Tarim mummies to conclude that Uyghurs have over 6400 years of history, and the World Uyghur Congress claimed a 4,000-year history in East Turkestan. However, the official Chinese view asserts that the Uyghurs in Xinjiang originated from the Tiele tribes and only became the main social and political force in Xinjiang during the ninth century when they migrated to Xinjiang from Mongolia after the collapse of the Uyghur Khaganate, replacing the Han Chinese they claimed were there since the Han Dynasty. Many contemporary Western scholars, however, do not consider the modern Uyghurs to be of direct linear descent from the old Uyghur Khaganate of Mongolia. Rather, they consider them to be descendants of a number of peoples, one of them the ancient Uyghurs.
Uyghur Khaganate
In 1209, The Qocho ruler Baurchuk Art Tekin declared his allegiance to Genghis Khan, and the Uyghurs became important civil servants in the later Mongol Empire, which adapted the Old Uyghur alphabet as its official script. According to the "New Book of Tang", a third group went to seek refuge among the Karluks. The Karluks, together with other tribes such as the Chigils and Yagmas, later founded the Kara-Khanid Khanate (940–1212). Some historians associate the Karakhanids with the Uyghurs as the Yaghmas were linked to the Toquz Oghuz. Sultan Satuq Bughra Khan, believed to be a Yagma from Artux, converted to Islam in 932 and seized control of Kashgar in 940, giving rise to the new Dynasty, known as "Karakhanids".