the 1130s, and in 1209 submitted voluntarily to the rising Mongol Empire. The Uyghurs of Kingdom of Qocho were allowed significant autonomy and played an important role as civil servants to the Mongol Empire, but was finally destroyed by the Chagatai Khanate by the end of the 14th century. Islamization In the tenth century, the Karluks, Yagmas, Chigils and other Turkic tribes founded the Kara-Khanid Khanate in Semirechye, Western Tian Shan, and Kashgaria and later conquered Transoxiana. The Karakhanid rulers were likely to be Yaghmas who were associated with the Toquz Oghuz and some historians therefore see this as a link between the Karakhanid and the Uyghurs of the Uyghur Khaganate, although this connection is disputed by others. The Karakhanids converted to Islam in the tenth century beginning with Sultan Satuq Bughra Khan, the first Turkic dynasty to do so. Modern Uyghurs see the Muslim Karakhanids as an important part of their history; however, Islamization of the people of the Tarim Basin was a gradual process. The Indo-Iranian Saka Buddhist Kingdom of Khotan was conquered by the Turkic Muslim Karakhanids from Kashgar in the early 11th century, but Uyghur Qocho remained mainly Buddhist until the 15th century, and the conversion of the Uyghur people to Islam was not completed until the 17th century. The 12th and 13th century saw the domination by non-Muslim powers: first the Kara-Khitans in the 12th century, followed by the Mongols in the 13th century. After the death of Genghis Khan in 1227, Transoxiana and Kashgar became the domain of his second son, Chagatai Khan. The Chagatai Khanate split into two in the 1340s, and the area of the Chagatai Khanate where the modern Uyghurs live became part of Moghulistan, which meant "land of the Mongols". In the 14th century, a Chagatayid khan Tughluq Temür converted to Islam, Genghisid Mongol nobilities also followed him to convert to Islam. His son Khizr Khoja conquered Qocho and Turfan (the core of Uyghuristan) in the 1390s, and the Uyghurs there became largely Muslim by the beginning of the 16th century. After being converted to Islam, the descendants of the previously Buddhist Uyghurs in Turfan failed to retain memory of their ancestral legacy and falsely believed that the "infidel Kalmuks" (Dzungars) were the ones who built Buddhist structures in their area. From the late 14th through 17th centuries, the Xinjiang region became further subdivided into Moghulistan in the north, Altishahr