Tibetan Empire
Reign of Tride Tsuktsän (704–754)

Gyeltsugru (Rgyal-gtsug-ru), later to become King Tride Tsuktsen (Khri-lde-gtsug-brtsan), generally known now by his nickname Me Agtsom ("Old Hairy"), was born in 704. Upon the death of Tridu Songtsen, his mother Thrimalö ruled as regent for the infant Gyältsugru. The following year the elder son of Tridu Songtsen, Lha Balpo (Lha Bal-pho) apparently contested the succession of his one-year-old brother, but was "deposed from the throne" at Pong Lag-rang.

Thrimalö had arranged for a royal marriage to a Chinese princess. The Princess Jincheng (Tibetan: Kyimshang Kongjo) arrived in 710, but it is somewhat unclear whether she married the seven-year-old Gyeltsugru or the deposed Lha Balpo. Gyeltsugru also married a lady from Jang (Nanzhao) and another born in Nanam.

Gyältsugru was officially enthroned with the royal name Tride Tsuktsän in 712, the year that dowager empress Thrimalö died.

The Umayyad Caliphate and Turgesh became increasingly prominent during 710–720. The Tibetans were allied with the Türgesh. Tibet and China fought on and off in the late 720s. At first Tibet (with Türgesh allies) had the upper hand, but then they started losing battles. After a rebellion in southern China and a major Tibetan victory in 730, the Tibetans and Türgesh sued for peace.

The Tibetans aided the Turgesh in fighting against the Muslim Arabs during the Muslim conquest of Transoxiana.

In 734, the Tibetans married their princess Dronmalön (‘Dron ma lon) to the Türgesh Qaghan. The Chinese allied with the Caliphate to attack the Türgesh. After victory and peace with the Türgesh, the Chinese attacked the Tibetan army. The Tibetans suffered several defeats in the east, despite strength in the west. The Türgesh empire collapsed from internal strife. In 737, the Tibetans launched an attack against the king of Bru-za (Gilgit), who asked for Chinese help, but was ultimately forced to pay homage to Tibet. In 747, the hold of Tibet was loosened by the campaign of general Gao Xianzhi, who tried to re-open the direct communications between Central Asia and Kashmir.

By 750, the Tibetans had lost almost all of their central Asian possessions to the Chinese. In 753, even the kingdom of "Little Balur" (modern Gilgit) was captured by the Chinese. However, after Gao Xianzhi's defeat by the Caliphate and Karluks at the Battle of Talas (751), Chinese influence decreased rapidly and Tibetan influence began to increase again. Tibet conquered large sections of northern India during this time.

In 755, Tride Tsuktsen was killed by the ministers Lang and ‘Bal. Then Takdra Lukong (Stag-sgra Klu-khong) presented evidence to prince Song Detsen (Srong-lde-brtsan) that they were disloyal and causing dissension in the country, and were about to attack him also. Lang and ‘Bal subsequently did revolt; they were killed by the army and their property was confiscated.
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