 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.There are also examples of Uyghur poetry, though most have survived only in Chinese translation.