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 Phagpa and his successors as Sakya lamas were not literally viceroys under the Yuan although they were at the center of the Yuan administrative system in Tibet. Moreover, after Phagpa the offices of Imperial Preceptor and Sakya Trizin were kept strictly separate. While the later chronicles depict Phagpa and his successors as ruling over the 13 myriarchies and in an extended sense over the three cholka, the authority of the Sakya Trizin was restricted to spiritual affairs. Given the paramount importance of the Buddhist religious hierarchy in Tibet, this still gave him an amount of influence. Phagpa spent his last years in Tibet, where he was busy strengthening Sakya-Yuan authority over the still-restless country. He convened a general conference of the Buddhist hierarchs in 1277 with both spiritual and political leanings. He died in the Lhakhang palace in Sakya on 15 December 1280. There was an unsubstantiated rumour that he had been