There were several Mongol invasions of Tibet. The earliest is the alleged plot to invade Tibet by Genghis Khan in 1206, which is considered anachronistic; there is no evidence of Mongol-Tibetan encounters prior to the military campaign in 1240. The first confirmed campaign is the invasion of Tibet by the Mongol general Doorda Darkhan in 1240, a campaign of 30,000 troops that resulted in 500 casualties. The campaign was smaller than the full-scale invasions used by the Mongols against large empires. The purpose of this attack is unclear, and is still in debate among Tibetologists. Then in the late 1240s Mongol prince Godan invited Sakya lama Sakya Pandita, who urged other leading Tibetan figures to submit to Mongol authority. This is generally considered to have marked the beginning of Mongol rule over Tibet, as well as the establishment of patron and priest relationship between Mongols and Tibetans. These relations were continued by Kublai Khan, who founded the Mongol Yuan dynasty and granted authority over whole Tibet to Drogon Chogyal Phagpa, nephew of Sakya Pandita. The Sakya-Mongol administrative system and Yuan administrative rule over the region lasted until the mid-14th century, when the Yuan dynasty began to crumble.
In the early 17th century, the Oirat Mongols again conquered the region and established the Khoshut Khanate. Since then the Mongols had intervened in Tibetan politics until the Qing conquest of Mongolia and Dzungaria.
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