Tibetan Buddhism evolved as a form of Mahāyāna Buddhism stemming from the latest stages of Indian Buddhism (which also included many Vajrayāna elements). It thus preserves many Indian Buddhist tantric practices of the post-Gupta Early Medieval period (500 to 1200 CE), along with numerous native Tibetan developments. In the pre-modern era, Tibetan Buddhism spread outside of Tibet primarily due to the influence of the Mongol Yuan dynasty (1271–1368), founded by Kublai Khan, which had ruled China, Mongolia and parts of Siberia. In the Modern era, Tibetan Buddhism has spread outside of Asia due to the efforts of the Tibetan diaspora (1959 onwards).