Tibetan Empire
The Tibetan Empire (, ; ) was an empire centered on the Tibetan Plateau, formed as a result of imperial expansion under the Yarlung dynasty heralded by its 33rd king, Songtsen Gampo, in the 7th century. The empire further expanded under the 38th king, Trisong Detsen, and expanded to its greatest extent under the 41st king, Rapalchen, whose 821–823 treaty was concluded between the Tibetan Empire and the Tang dynasty. This treaty, carved into the Jokhang Pillar, delineated Tibet as being in possession of an area larger than the Tibetan Plateau, stretching east to Chang'an, west beyond modern Afghanistan, and south into modern India and the Bay of Bengal. The Yarlung dynasty was founded in 127 BCE in the Yarlung Valley along the Yarlung River, south of Lhasa. The Yarlung capital was moved in the 7th century from the palace Yumbulingka to Lhasa by the 33rd king Songsten 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. The power of Tibet's military empire 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 the 41st king Ralpachen through his 821–823 treaty between the Tibetan Empire and Tang dynasty, which was also commemorated by three inscribed stelae. 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 King Rapalchen 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, Iha-tho-tho-ri (Thori Nyatsen), and then safeguarded. Later, Tibet marked the advent of its empire period under King Songsten 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 revealing of the Vajrayana by Guru Padmasambhava was occurring. The empire period then corresponded to the reigns of Tibet's three 'Religious Kings', which includes King Rapalchen's reign. After Rapalchen's murder, King Lang darma 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 () 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. "This first mention of the name Bod, the usual name for Tibet in the later Tibetan historical sources, is significant in that it is used to refer to a conquered region. In other words, the ancient name Bod originally referred only to a part of the Tibetan Plateau, a part which, together with Rtsaṅ (Tsang, in Tibetan now spelled Gtsaṅ) has come to be called Dbus-gtsaṅ (Central Tibet)." Reign of Songtsen Gampo (618–650)
Songtsen Gampo (Srong-brtsan Sgam-po) (c. 604 – 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. When his father Namri Songtsen died by poisoning (circa 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 ca. 627. Six years later (c. 632–33) 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 (Tibetan: ‘A zha), 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 in 635-8,（see also Tibetan attack on Songzhou）the Chinese emperor agreed (only because of the threat of force, according to Tibetan sources) to provide a Chinese princess to Songtsen Gampo. Circa 639, after Songtsen Gampo 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 (Tibetan: Mung-chang Kung-co) departed China in 640 to marry Songtsen Gampo's son. 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 until 797 or 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 country 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)

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 or Khri-'dus-srong-rtsan) 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; also sgar and ′gar). (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 Tridring Tsendrö (mgar Khri-‘bring-btsan brod) was appointed to replace him. In 692, the Tibetans lost the Tarim Basin to the Chinese. Gar Tridring Tsendrö defeated the Chinese in battle in 696 and sued for peace. Two years later in 698 emperor Tridu Songtsen reportedly invited the Gar clan (who numbered more than 2000 people) to a hunting party and had them massacred. Gar Tridring 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)Beckwith, C. I. "The Revolt of 755 in Tibet", p. 5 note 10. In: Weiner Studien zur Tibetologie und Buddhismuskunde. Nos. 10–11. [Ernst Steinkellner and Helmut Tauscher, eds. Proceedings of the Csoma de Kőrös Symposium Held at Velm-Vienna, Austria, 13–19 September 1981. Vols. 1–2.] Vienna, 1983. but died during the prosecution of that campaign. 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.Beckwith, C. I. "The Revolt of 755 in Tibet", pp. 1–14. In: Weiner Studien zur Tibetologie und Buddhismuskunde. Nos. 10–11. [Ernst Steinkellner and Helmut Tauscher, eds. Proceedings of the Csoma de Kőrös Symposium Held at Velm-Vienna, Austria, 13–19 September 1981. Vols. 1–2.] Vienna, 1983. 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. Reign of Trisong Detsen (756–797?) In 756, prince Song Detsän was crowned Emperor 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 emperor. In 755, China had already begun to be weakened because of the An Shi Rebellion started by An Lushan in 751, which would last until 763. In contrast, Trisong Detsän's reign was characterised by the reassertion of Tibetan influence in Central Asia. Early in his reign regions to the West of Tibet paid homage to the Tibetan court. From that time onward the Tibetans pressed into the territory of the Tang emperors, reaching the Chinese capital Chang'an (modern Xi'an) in late 763. Tibetan troops under the command of Nganlam Takdra Lukhong occupied Chang'an for fifteen days and installed a puppet emperor while Emperor Daizong was in Luoyang. Nanzhao (in Yunnan and neighbouring regions) remained under Tibetan control from 750 to 794, when they turned on their Tibetan overlords and helped the Chinese inflict a serious defeat on the Tibetans. In 785, Wei Kao, a Chinese serving as an official in Shuh, repulsed Tibetan invasions of the area. In the meantime, the Kyrgyz negotiated an agreement of friendship with Tibet and other powers to allow free trade in the region. An attempt at a peace treaty between Tibet and China was made in 787, but hostilities were to last until the Sino-Tibetan treaty of 821 was inscribed in Lhasa in 823 (see below). At the same time, the Uyghurs, nominal allies of the Tang emperors, continued to make difficulties along Tibet's Northern border. Toward the end of this king's reign Uyghur victories in the North caused the Tibetans to lose a number of their allies in the Southeast. Recent historical research indicates the presence of Christianity in as early as the sixth and seventh centuries, a period when the Hephthalites had extensive links with the Tibetans. A strong presence existed by the eighth century when Patriarch Timothy I (727–823) in 782 calls the Tibetans one of the more significant communities of the eastern church and wrote of the need to appoint another bishop in ca. 794. There is a stone pillar (now blocked off from the public), the Lhasa Shöl rdo-rings, Doring Chima or Lhasa Zhol Pillar, in the ancient village of Shöl in front of the Potala in Lhasa, dating to c. 764 CE during Trisong Detsen's reign. It also contains an account of the conquest of large swathes of northwestern China including the capture of Chang'an, the Chinese capital, for a short period in 763 CE, during the reign of Emperor Daizong.A Corpus of Early Tibetan Inscriptions. H. E. Richardson. Royal Asiatic Society (1985), pp. 1–25. . Reign of Muné Tsenpo (c. 797–799?) Trisong Detsen is said to have had four sons. The eldest, Mutri Tsenpo, apparently died young. When Trisong Detsen retired he handed power to the eldest surviving son, Muné Tsenpo (Mu-ne btsan-po). Most sources say that Muné's reign lasted only about a year and a half. After a short reign, Muné Tsenpo was supposedly poisoned on the orders of his mother. After his death, Mutik Tsenpo was next in line to the throne. However, he had been apparently banished to Lhodak Kharchu (lHo-brag or Lhodrag) near the Bhutanese border for murdering a senior minister. The youngest brother, Tride Songtsen, was definitely ruling by AD 804.Richardson, Hugh. A Corpus of Early Tibetan Inscriptions (1981), p. 44. Royal Asiatic Society, London. . Reign of Tride Songtsen (799–815)
Under Tride Songtsen (Khri lde srong brtsan – generally known as Sadnalegs), there was a protracted war with the Abbasid Caliphate. It appears that Tibetans captured a number of Caliphate troops and pressed them into service on the eastern frontier in 801. Tibetans were active as far west as Samarkand and Kabul. Abbasid forces began to gain the upper hand, and the Tibetan governor of Kabul submitted to the Caliphate and became a Muslim about 812 or 815. The Caliphate then struck east from Kashmir but were held off by the Tibetans. In the meantime, the Uyghur Khaganate attacked Tibet from the northeast. Strife between the Uyghurs and Tibetans continued for some time. Reign of Tritsu Detsen (815–838)

Tritsu Detsen (Khri gtsug lde brtsan), best known as Ralpacan, is important to Tibetan Buddhists as one of the three Dharma Kings''' who brought Buddhism to Tibet. He was a generous supporter of Buddhism and invited many craftsmen, scholars and translators from neighbouring countries. He also promoted the development of written Tibetan and translations, which were greatly aided by the development of a detailed Sanskrit-Tibetan lexicon called the Mahavyutpatti which included standard Tibetan equivalents for thousands of Sanskrit terms.Ancient Tibet: Research Materials from the Yeshe De Project (1986), pp. 296–97. Dharma Publishing, California. . Tibetans attacked Uyghur territory in 816 and were in turn attacked in 821. After successful Tibetan raids into Chinese territory, Buddhists in both countries sought mediation. Ralpacan was apparently murdered by two pro-Bön ministers who then placed his anti-Buddhist brother, Langdarma, on the throne. Tibet continued to be a major Central Asian empire until the mid-9th century. It was under the reign of Ralpacan that the political power of Tibet was at its greatest extent, stretching as far as Mongolia and Bengal, and entering into treaties with China on a mutual basis. A Sino-Tibetan treaty was agreed on in 821/822 under Ralpacan, which established peace for more than two decades. A bilingual account of this treaty is inscribed on a stone pillar which stands outside the Jokhang temple in Lhasa. Reign of Langdarma (838–842)

The reign of Langdarma (Glang dar ma), regal title Tri Uidumtsaen (Khri 'U'i dum brtsan), was plagued by external troubles. The Uyghur state to the north collapsed under pressure from the Kyrgyz in 840, and many displaced people fled to Tibet. Langdarma himself was assassinated, apparently by a Buddhist hermit, in 842.Shakabpa, p. 54. Decline

A civil war that arose over Langdarma's successor led to the collapse of the Tibetan Empire. The period that followed, known traditionally as the Era of Fragmentation, was dominated by rebellions against the remnants of imperial Tibet and the rise of regional warlords. Military
Armor
The soldiers of the Tibetan Empire wore armour such as lamellar and chainmail, and were proficient in the use of swords and lances. According to the Tibetan author Tashi Namgyal, writing in 1524, the history of lamellar armour in Tibet was divided into three distinct periods. The oldest armour dated from the time of the "Righteous Kings, Uncle, and Nephew" which would place it sometime during the Yarlung dynasty, early seventh to mid ninth century. According to Du You (735–812) in his encyclopaedic text, the Tongdian, the Tibetans were less proficient in archery and fought in the following manner:

The Tibetans might have exported their armour to the neighbouring steppe nomads. When the Turgesh attacked the Arabs, their khagan Suluk was reported to have worn Tibetan armour, which saved him from two arrows before a third penetrated his breast. He survived the ordeal with some discomfort in one arm. Organization
The Tibetan Empire's officers were not employed full-time and were only called upon on an ad hoc basis. These warriors were designated by a golden arrow seven inches long which signified their office. The officers gathered once a year to swear an oath of fealty. They assembled every three years to partake in a sacrificial feast. While on campaign, Tibetan armies carried no provision of grain and lived on plunder. Society

The early Tibetans worshipped a god of war known as "Yuandi" (Chinese transcription) according to a Chinese transliteration from the Old Book of Tang. The Old Book of Tang states:

