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In page Tibet Autonomous Region:

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Yarlung kings founded the Tibetan Empire in 618. By the end of the 8th century, the empire reached its greatest extent. After a civil war, the empire broke up in 842. The royal lineage fragmented and ruled over small kingdoms such as Guge and Maryul. The Mongols conquered Tibet in 1244 and later ruled it under the Yuan Dynasty but granted the region a degree of political autonomy. The Sakya lama Drogön Chögyal Phagpa became a religious teacher to Kublai Khan in the 1250s and was made the head of the Tibetan region administration c. 1264.[citation needed]