decline and end of the Mongol Yuan dynasty, Tibet regained independence and was ruled by successive local families from the 14th to the 17th century. Jangchub Gyaltsän (1302–1364) became the strongest political family in the mid 14th century. During this period the reformist scholar Je Tsongkhapa (1357–1419) founded the Gelug school which would have a decisive influence on Tibet's history. The Ganden Tripa is the nominal head of the Gelug school, though its most influential figure is the Dalai Lama. The Ganden Tripa is an appointed office and not an reincarnation lineage. The position can be held by an individual for seven years and this has led to more Ganden Tripas than Dalai Lamas Internal strife within the Phagmodrupa dynasty, and the strong localism of the various fiefs and political-religious factions, led to a long series of internal conflicts. The minister family Rinpungpa, based in Tsang (West Central Tibet), dominated politics after 1435. In 1565, the Rinpungpa family was overthrown by the Tsangpa Dynasty of Shigatse, which expanded its power in different directions of Tibet in the following decades and favoured the Karma Kagyu sect. They would play a pivotal role in the events which led to the rise of power of the Dalai Lama's in the 1640s. In China, Tibetan Buddhism continued to be patronized by the elites of the Ming Dynasty. According to David M. Robinson, during this era, Tibetan Buddhist monks "conducted court rituals, enjoyed privileged status and gained access to the jealously guarded, private world of the emperors". The Ming Yongle Emperor (r. 1402–1424) promoted the carving of printing blocks for the Kangyur, now known as "the Yongle Kanjur", and seen as an important edition of the collection. The Ming Dynasty also supported the propagation of Tibetan Buddhism in Mongolia during this period. Tibetan Buddhist missionaries also helped spread the religion in Mongolia. It was during this era that Altan Khan the leader of the Tümed Mongols, converted to Buddhism, and allied with the Gelug school, conferring the title of Dalai Lama to Sonam Gyatso in 1578. During a Tibetan civil war in the 17th century, Sonam Choephel (1595–1657 CE), the chief regent of the 5th Dalai Lama, conquered and unified Tibet to establish the Ganden Phodrang government with the help of the Güshi Khan of the Khoshut Mongols. The Ganden Phodrang and the successive Gelug tulku lineages of the Dalai Lamas and Panchen Lamas maintained