Tengrism differs from contemporary Siberian shamanism in that it was a more organized religion. Additionally the polities practicing it were not small bands of hunter-gatherers like the Paleosiberians, but a continuous succession of pastoral, semi-sedentarized khanates and empires from the Xiongnu Empire (founded 209 BC) to the Mongol Empire (13th century). Among Turkic peoples it was radically supplanted by Islam, while in Mongolia it survives as a synthesis with Tibetan Buddhism while surviving in purer forms around Lake Khovsgol and Lake Baikal. Unlike Siberian shamanism, which has no written tradition, Tengrism can be identified from Turkic and Mongolic historical texts like the Orkhon inscriptions, "Secret History of the Mongols", and "Altan Tobchi". However, these texts are more historically oriented and are not strictly religious texts like the scriptures and sutras of sedentary civilizations, which have elaborate doctrines and religious stories.