Tocharian languages
As Manichaeism was persecuted around Mesopotamia and the regions of the Sasanian Empire, its origins, it became well-established in Central Asia and along the Silk Road. It became an official state religion among the Uyghurs for five centuries (from the 8th through the 12th century), and thus many surviving manuscripts are found in the Turpan region in the Iranian languages aforementioned, the Old Uyghur language, and the Tocharian languages.