poisoned by the former pönchen Kunga Zangpo, whom he had dismissed some years previously for highhanded conduct. This led to an armed intervention by an army of Mongols and Amdo Tibetans in the next year, resulting in the execution of Kunga Zangpo and the strengthening of Mongol military presence in Tibet. The system lasted until about the middle of the 14th century. During the reign of the 14th Sakya Trizin, Lama Dampa Sonam Gyaltsen, the myriarch Tai Situ Changchub Gyaltsen of the Phagmodrupa Dynasty began to expand his power in the central province of Ü, marking the "beginning of the end of the period of Sakya power in Central Tibet." Cultural references Phagpa is played by James Hong in the 1982 miniseries Marco Polo. In the series he is erroneously depicted as alive at the time of the departure of Marco Polo from China in 1293. Translations Chogyal Phagpa: The Emperor's Guru (Sakya Kongma Series Book 5). Translated by Christopher Wilkinson (CreateSpace, 2014). Advice to Kublai Khan: Letters by the Tibetan Monk Chogyal Phagpa to Kublai Khan and his Court. Translated by Christopher Wilkinson (CreateSpace, 2015). At the Court of Kublai Khan: Writings of the Tibetan Monk Chogyal Phagpa. Translated by Christopher Wilkinson (CreateSpace, 2016). See also Tibet under Yuan rule Bureau of Buddhist and Tibetan Affairs History of Tibet Mongol conquest of Tibet Patron and priest relationship Footnotes References Sakya Trizins Imperial Preceptors Creators of writing systems Tibetan Buddhists from Tibet Yuan dynasty people Mongolia–Tibet relations 1235 births 1280 deaths 13th-century educators 13th-century Tibetan people 13th-century lamas