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Tibet has been invaded by the Mongol Empire in 1240 and 1244. The first invasion was by Prince Köden or Godan, grandson of Genghis Khan and son of Ögedei Khan. The second invasion by Möngke Khan resulted in the entire region falling under Mongol rule. Kublai Khan incorporated the region into his later Yuan dynasty, but left the legal system intact. Drogön Chögyal Phagpa, the Sakya lama, became a religious teacher to Kublai, who made him the nominal head of the region.