(Xuanzheng Yuan). The Sakya-Mongol alliance was strong, and the seat () of the Sakya became the capital of Tibet. According to later historiography,
Kublai Khan (who founded of the
Yuan dynasty in 1271) granted the three
cholka or regions of Tibet (
Ü-Tsang,
Amdo and
Kham) to Phagpa as a reward for the initiation in the Buddhist faith. The donation would have taken place in 1253. However, this tradition has been qualified by recent research. As mentioned above, Kublai's brother and predecessor
Möngke Khan divided Central Tibet into appanages obedient under various Mongol princes in 1251. In the next year he issued a decree saying that the main Buddhist precepts to be followed in Tibet were to be those of Sakya. In about 1260 the appanage system was withdrawn, and Phagpa, receiving the title State Preceptor (Guoshi), was acknowledged as the supreme head of the Buddhist clergy. In 1264, Kublai Khan established the
Bureau of Buddhist and Tibetan Affairs. At about the same time, Phagpa was sent from the court to Tibet in order to persuade the local leaders to accept the imposition of Mongol administration. It was his first visit to his homeland since childhood. Phagpa received the new title of
Imperial Preceptor (Dishi) in 1270, partly as a reward for his invention of the Phagpa script. As such, he was expected to stay close to the emperor and had a paramount influence over the Bureau of Buddhist and Tibetan Affairs. His decrees carried the weight of the imperial court which gave him a strong authority over Tibetan affairs. However, Phagpa mostly resided in
Lintao in Gansu and apparently had desultory contacts with the emperor. He vacated the post by 1274 and returned to Sakya, leaving the title to his brother,
Rinchen Gyaltsen. Kublai Khan made Phagpa's other brother Chakna Dorje viceroy of Tibet in 1264. However, he died in 1267 and no new viceroy was appointed for many years. His untimely death was followed by a rebellion led by the Drikung Kagyu, the main opponents of the Sakya. Kublai Khan sent a punitive force to Tibet, which suppressed the uprising by 1268. Temporal administration of Tibet was actually in the hands of officials from Sakya known as
dpon-chen or
pönchen. Their functions were defined as follows: "He governs by order of the lama and by the mandate of the emperor. He protects the two laws (religious and civil) and keeps the realm tranquil and the religion flourishing." A
dpon-chen with responsibility for Central Tibet was stationed in Sakya from c. 1264. An implemented Mongol rule began about 1268-69 when a census was carried out and a Mongol administrative structure was set up. By this time Central Tibet was divided into 13
trikor, usually rendered in English as "myriarchies", each under a local lord called
tripon. Meanwhile, other Sakya
dpon-chen resided in Gongyo in Doto (Kham) and Lingtsang in Doma (Amdo). The
dpon-chen of Ü-Tsang in this period were: • Shakya Zangpo (c. 1264–1270) • Kunga Zangpo (c. 1270–1275) • Zhangtsun (c. 1275-?) • Chukpo Gangkarwa (?-1280) ==Last years and death==