 The modern Ket lived in the eastern middle areas of the river before being assimilated politically into Russia during the 17th through 19th centuries.Some of the earliest known evidence of Turkic origins was found in the Yenisey Valley in the form of stelae, stone monoliths and memorial tablets dating from between the 7th and 9th centuries AD, along with some documents that were found in China's Xinjiang region.The written evidence gathered from these sources tells of battles fought between the Turks and the Chinese and other legends.