The Tibetan Empire (Tibetan: བོད་ཆེན་པོ, Wylie: bod chen po, lit. 'Great Tibet') was centered on the Tibetan Plateau and formed as a result of expansions under the Yarlung dynasty's 33rd king, Songtsen Gampo, in the 7th century. It expanded further under Trisong Detsen and reached its greatest extent under Tritsuk Detsen, stretching east to Chang'an, west beyond modern Afghanistan, south into modern India and the Bay of Bengal. It is referred to as Tufan or Tubo (吐蕃) in Chinese sources.
The Yarlung dynasty was founded in 127 BC in the Yarlung Valley along the Yarlung River, south of Lhasa. The capital was moved in the 7th century from the Yungbulakang Palace to Lhasa by the 33rd ruler Songtsen Gampo, and into the Red Fort during the imperial period which continued to the 9th century. The beginning of the imperial period is marked in the reign of the 33rd king of the Yarlung dynasty, Songtsen Gampo. Tibet's military power gradually increased over a diverse terrain. During the reign of Trisong Detsen, the empire became more powerful and increased in size. At this time, a 783 treaty between the Tibetan Empire and the Tang dynasty defined the borders, as commemorated by the Shol Potala Pillar in Lhasa. Borders were again confirmed during the later reign of Tritsuk Detsen through his 821–823 treaty, which was inscribed on a pillar at Jokhang. In the opening years of the 9th century, the Tibetan Empire controlled territories extending from the Tarim Basin to the Himalayas and Bengal, and from the Pamirs into what are now the Chinese provinces of Sichuan, Gansu and Yunnan. The murder of Tritsuk Detsen in 838 by his brother Langdarma, and Langdarma's subsequent enthronement followed by his assassination in 842 marks the simultaneous beginning of the dissolution of the empire period.
Before the empire period, sacred Buddhist relics were discovered by the Yarlung dynasty's 28th king, Thothori Nyantsen (lha-tho-tho-ri), and then safeguarded. Later, Tibet marked the advent of its empire period under King Songtsen Gampo, while Buddhism initially spread into Tibet after the king's conversion to Buddhism, and during his pursuits in translating Buddhist texts while also developing the Tibetan language. Under King Trisong Detsen, the empire again expanded as the founding of Tibetan Buddhism and the establishment of the Vajrayana in Tibet by Guru Padmasambhava was occurring.
The empire period then corresponded to the reigns of Tibet's three 'Religious Kings', which includes King Ralpachen's reign. After Ralpachen's murder, King Langdarma nearly destroyed Tibetan Buddhism through his widespread targeting of Nyingma monasteries and monastic practitioners. His undertakings correspond to the subsequent dissolution of the unified empire period, after which semi-autonomous polities of chieftains, minor kings and queens, and those surviving Tibetan Buddhist polities evolved once again into autonomous independent polities, similar to those polities also documented in the Tibetan Empire's nearer frontier region of Do Kham (Amdo and Kham).
Other unreferenced ideas about the dissolution of the empire period include: The varied terrain of the empire and the difficulty of transportation, coupled with the new ideas that came into the empire as a result of its expansion, helped to create stresses and power blocs that were often in competition with the ruler at the center of the empire. Thus, for example, adherents of the Bön religion and the supporters of the ancient noble families gradually came to find themselves in competition with the "recently" introduced Tibetan Buddhism.
History
Namri Songtsen and founding of the dynasty
The power that became the Tibetan state originated at the Taktsé Castle (Wylie: Stag-rtse) in the Chingba (Phying-ba) district of Chonggyä (Phyongs-rgyas). There, according to the Old Tibetan Chronicle, a group convinced Tagbu Nyazig (Stag-bu snya-gzigs) to rebel against Gudri Zingpoje (Dgu-gri Zing-po-rje), who was, in turn, a vassal of the Zhangzhung empire under the Lig myi dynasty. The group prevailed against Zingpoje. At this point Namri Songtsen (also known as Namri Löntsän) was the leader of a clan which one by one prevailed over all his neighbouring clans. He besieged the Kingdom of Sumpa in the early 7th century and eventually conquered it. He gained control of all the area around what is now Lhasa, before his assassination around 618. This new-born regional state would later become known as the "Tibetan Empire". The government of Namri Songtsen sent two embassies to the Chinese Sui dynasty in 608 and 609, marking the appearance of Tibet on the international scene.
Reign of Songtsen Gampo (618–650)
Songtsen Gampo (Srong-brtsan Sgam-po) (c. 604 – c. 650) was the first great emperor who expanded Tibet's power beyond Lhasa and the Yarlung Valley, and is traditionally credited with introducing Buddhism to Tibet. The Tibetan script was also created during his reign.
When his father Namri Songtsen died by poisoning (c. 618), Songtsen Gampo took control after putting down a brief rebellion. Songtsen Gampo proved adept at diplomacy as well as combat. The emperor's minister, Myang Mangpoje (Myang Mang-po-rje Zhang-shang), defeated the Sumpa people (c. 627). Six years later (c. 632 – c. 633), Myang Mangpoje was accused of treason and executed. He was succeeded by minister Gar Tongtsen (mgar-stong-btsan).
The Chinese records mention an envoy to Tibet in 634. On that occasion, the Tibetan Emperor requested (demanded according to Tibetan sources) marriage to a Chinese princess but was refused. In 635–36, the Emperor attacked and defeated the Tuyuhun ('Azha), who lived around Lake Koko Nur and controlled important trade routes into China. After a series of military campaigns between Tibet and the Tang dynasty, the Tibetan Empire sent envoys to apologize to the Tang Dynasty with gifts, and the Chinese emperor agreed to provide a Chinese princess to Songtsen Gampo. Following this, the Tang Dynasty and Tibetan Empire established an alliance.
After Songtsen Gampo (c. 639), had a dispute with his younger brother Tsänsong (Brtsan-srong), the younger brother was burned to death by his own minister Khäsreg (Mkha's sregs) (presumably at the behest of his older brother the emperor).
The Chinese Princess Wencheng (Mung-chang Kung-co) departed China in 640 to marry Songtsen Gampo. She arrived a year later. This is traditionally credited with being the first time that Buddhism came to Tibet, but it is very unlikely Buddhism extended beyond foreigners at the court.
Songtsen Gampo's sister Sämakar (Sad-mar-kar) was sent to marry Lig-myi-rhya, the king of Zhangzhung in what is now Western Tibet. However, when the king refused to consummate the marriage, she then helped her brother to defeat Lig myi-rhya and incorporate Zhangzhung into the Tibetan Empire. In 645, Songtsen Gampo overran the kingdom of Zhangzhung.
Songtsen Gampo died in 650. He was succeeded by his infant grandson Trimang Lön (Khri-mang-slon). Real power was left in the hands of the minister Gar Tongtsen. There is some confusion as to whether Central Tibet conquered Zhangzhung during the reign of Songtsen Gampo or in the reign of Trisong Detsen, (r. 755 – c. 797 – c. 804). The records of the Tang Annals do, however, seem to clearly place these events in the reign of Songtsen Gampo for they say that in 634, Zhangzhung and various Qiang tribes "altogether submitted to him." Following this, he united with the nation of Zhangzhung to defeat the Tuyuhun, then conquered two more Qiang tribes before threatening the Chinese region of Songzhou with a very large army (according to Tibetan sources 100,000; according to the Chinese more than 200,000 men). He then sent an envoy with gifts of gold and silk to the Chinese emperor to ask for a Chinese princess in marriage and, when refused, attacked Songzhou. According to the Tang Annals, he finally retreated and apologised, after which the emperor granted his request.
After the death of Songtsen Gampo in 650 AD, the Chinese Tang dynasty attacked and took control of the Tibetan capital Lhasa. Soldiers of the Tang dynasty could not sustain their presence in the hostile environment of the Tibetan Plateau and soon returned to China proper."
Reign of Mangsong Mangtsen (650–676)
In 663, the Azha or Tuyuhun kingdom, which had served as a buffer between Tibet and China in the area that later became known as Amdo, was defeated by the Tibetan army and gradually assimilated into Tibetan culture.
After having incorporated Tuyuhun into Tibetan territory, the powerful minister Gar Tongtsen died in 667. Between 665 and 670, Khotan was defeated by the Tibetans, and a long string of conflicts ensued with the Chinese Tang dynasty. In the spring of 670, Tibet attacked the remaining Chinese territories in the western Tarim Basin after winning the Battle of Dafeichuan against the Tang dynasty. With troops from Khotan they conquered Aksu, upon which the Chinese abandoned the region, ending two decades of Chinese control. They thus gained control over all of the Chinese Four Garrisons of Anxi in the Tarim Basin in 670 and held them until 692, when the Chinese finally managed to regain these territories.
Emperor Mangsong Mangtsen (Trimang Löntsen' or Khri-mang-slon-rtsan) married Thrimalö (Khri-ma-lod), a woman who would be of great importance in Tibetan history. The emperor died in the winter of 676–677, and Zhangzhung revolts occurred thereafter. In the same year the emperor's son Tridu Songtsen (Khri 'dus-srong btsan) was born.
Reign of Tridu Songtsen (677–704)
The power of Emperor Tridu Songtsen was offset, to an extent, by that of his mother, Thrimalö and the influence of the Gar clan. (Wylie: mgar). There is evidence that the Gar were descended from members of the Lesser Yuezhi, a people who had originally spoken an Indo-European language and migrated, sometime after the 3rd century BC, from Gansu or the Tarim into Kokonur.
In 685, minister Gar Tsenye Dompu (mgar btsan-snya-ldom-bu) died and his brother, Gar Trinring Tsendro (mgar Khri-'bring-btsan brod) was appointed to replace him. In 692, the Tibetans lost the Tarim Basin to the Chinese. Gar Trinring Tsendrö defeated the Chinese in battle in 696 and ensued for peace. Two years later in 698 emperor Tridu Songtsen invited the Gar clan (who numbered more than 2000 people) to a hunting party and had them massacred. Gar Trinring Tsendrö then committed suicide, and his troops joined the Chinese. This brought to an end the influence of the Gar.
From 700 until his death the emperor remained on campaign in the northeast, absent from Central Tibet, while his mother Thrimalö administrated in his name. In 702, Zhou China under Empress Wu Zetien and the Tibetan Empire concluded peace. At the end of that year, the Tibetan imperial government turned to consolidating the administrative organisation khö chenpo (mkhos chen-po) of the northeastern Sumru area, which had been the Sumpa country conquered 75 years earlier. Sumru was organised as a new "horn" of the empire.
During the summer of 703, Tridu Songtsen resided at Öljak ('Ol-byag) in Ling (Gling), which was on the upper reaches of the Yangtze, before proceeding with an invasion of Jang ('Jang), which may have been either the Mosuo or the kingdom of Nanzhao. In 704, he stayed briefly at Yoti Chuzang (Yo-ti Chu-bzangs) in Madrom (Rma-sgrom) on the Yellow River. He then invaded Mywa, which was at least in part Nanzhao (the Tibetan term mywa likely referring to the same people or peoples referred to by the Chinese as Man or Miao) but died during the prosecution of that campaign.
Reign of Tride Tsuktsen (704–754)
Gyeltsugru (Rgyal-gtsug-ru), later to become 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. 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 Tsuktsen in 712, the year that dowager empress Thrimalö died.
The Umayyad Caliphate and Turgesh became increasingly prominent in the 710s. 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 ensued 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.
Reign of Trisong Detsen (756–797)
In 756, prince Song Detsen was crowned king with the name Trisong Detsen (Khri srong lde brtsan) and took control of the government when he attained his majority at 13 years of age (12 by Western reckoning) after a one-year interregnum during which there was no king.