In the 9th century, they adopted the Buddhism religion of Uyghur Turks and developed the first large established Turkic culture on the basis of this religion. It is known that Uyghur monks translated thousands of Buddhist scriptures from Sanskrit and Chinese into Turkic during this period. Among these, many foreign legends were translated into Turkic, but old Turkic epics and history were also written down. They built the largest library of its time in the city of Khotan, but unfortunately this library was completely burned in an attack by the Kyrgyz. Only little of pages remain to this day, but the number of pages (page 500- page 600) appearing on some of these page fragments proves how extensive and detailed these books are.