The Tang dynasty was an imperial dynasty of China that ruled from 618 to 907, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdoms period. Historians generally regard the Tang as a high point of Chinese civilisation, and a golden age of cosmopolitan culture. Tang territory, acquired through the military campaigns of its early rulers, surpassed that of the Han dynasty.
The Li family founded the dynasty after taking advantage of a period of Sui decline and precipitating their final collapse, in turn inaugurating a period of progress and stability in the first half of the dynasty's rule. The dynasty was formally interrupted from 690 to 705 when Empress Wu Zetian seized the throne, proclaiming the Wu Zhou dynasty and becoming the only legitimate Chinese female emperor. The An Lushan rebellion (755–763) led to devastation and the decline of central authority during the latter half of the dynasty. The Tang maintained a civil-service system by recruiting scholar-officials through standardised examinations and recommendations to office. The rise of regional military governors known as jiedushi during the 9th century undermined civil order. The dynasty and central government went into decline by the latter half of the 9th century; agrarian rebellions resulted in mass population loss and displacement, widespread poverty, and further government dysfunction that ultimately ended the dynasty in 907.
The Tang capital at Chang'an (present-day Xi'an) was the world's most populous city for much of the dynasty's existence. Two censuses of the 7th and 8th centuries estimated the empire's population at about 50 million people, which grew to an estimated 80 million by the dynasty's end. The dynasty raised professional and conscripted armies of hundreds of thousands of troops to contend with nomadic powers for control of Inner Asia and the lucrative trade-routes along the Silk Road. Far-flung kingdoms and states paid tribute to the Tang court, while the Tang also indirectly controlled several regions through a protectorate system. In addition to its political hegemony, the Tang exerted a powerful cultural influence over neighbouring East Asian nations such as Japan and Korea.
Chinese culture flourished and further matured during the Tang era. It is traditionally considered the greatest age for Chinese poetry. Two of China's most famous poets, Li Bai and Du Fu, belonged to this age, contributing with poets such as Wang Wei to the monumental Three Hundred Tang Poems. Many famous painters such as Han Gan, Zhang Xuan, and Zhou Fang were active, while Chinese court music flourished with instruments such as the popular pipa. Tang scholars compiled a rich variety of historical literature, as well as encyclopaedias and geographical works. Notable innovations included the development of woodblock printing. Buddhism became a major influence in Chinese culture, with native Chinese sects gaining prominence. However, in the 840s, Emperor Wuzong enacted policies to suppress Buddhism, which subsequently declined in influence.
History
Establishment
The Tang dynasty was founded by Emperor Gaozu (born Li Yuan). He was previously the Duke of Tang and governor of Taiyuan, the capital of modern Shanxi, during the collapse of the Sui dynasty (581–618). The House of Li had ethnic Han origins, and it belonged to the northwest military aristocracy prevalent during the Sui dynasty. According to official Tang records, they were paternally descended from Laozi, the traditional founder of Taoism (whose personal name was Li Dan or Li Er), the Han dynasty general Li Guang, and Li Gao, the founder of the Han-ruled Western Liang kingdom. This family was known as the Longxi Li lineage, which also included the prominent Tang poet Li Bai. The Tang emperors were partially of Xianbei ancestry, as Emperor Gaozu of Tang's mother Duchess Dugu was part-Xianbei.
Some historians have argued that the Tang imperial family's ties to the distinguished Longxi Li clan of Han descent may be fabricated. Howard J. Wechsler notes that it has been suggested that the Tang House of Li was descended from a minor offshoot of the eastern Li clan of Zhaojun in Hebei that had intermarried substantially with non-Han tribal aristocracy. Chen Sanping argues that the House of Li had a patrilineal Xianbei lineage that was concealed by the royal family through modifying their genealogy. This argument is partially based on a comparison with Li Xian, a Northern Zhou general, whose epitaph states that he was both descended from the Han dynasty general Li Ling and Yidigui, a 10th generation ancestor who came from the steppes. However, a genetic study of the daughter of the Duke of Longxi (Li Hu), the Tang founder's paternal grandfather, and her nuclear family shows that they were primarily related to agricultural farming communities in northern China (95.8%–97.3%) with minor admixture with Eurasian Steppe pastoralists (2.7%–4.2%). The family's haplogroups are common in Han and East Asian populations and atypical in Xianbei individuals. Despite possessing Xianbei names (Bulugu and Daye), the findings suggest that they were likely Han aristocrats, reflecting the historical policy of granting Xianbei names to Han elites in Western Wei.
Li Yuan had prestige and military experience, and was a first cousin of Emperor Yang of Sui through their mothers, both of whom were one of the Dugu sisters). Li Yuan rose in rebellion in 617, along with his son and his equally militant daughter Princess Pingyang (d. 623), who raised and commanded her own troops. In winter 617, Li Yuan occupied Chang'an, relegated Emperor Yang to the position of Taishang Huang ('retired emperor'), and acted as regent to the puppet child-emperor Yang You. On the news of Emperor Yang's murder by General Yuwen Huaji on June 18, 618, Li Yuan declared himself emperor of the newly founded Tang dynasty.
Emperor Gaozu ruled until 626, when he was forcefully deposed by his son Li Shimin, the Prince of Qin. Li Shimin had commanded troops since the age of 18, had prowess with bow and arrow, sword and lance and was known for his effective cavalry charges. Fighting a numerically superior army, he defeated Dou Jiande (573–621) at Luoyang in the Battle of Hulao on May 28, 621. Due to fear of assassination, Li Shimin ambushed and killed two of his brothers, Li Yuanji (b. 603) and crown prince Li Jiancheng (b. 589), in the Xuanwu Gate Incident on July 2, 626. Shortly thereafter, his father abdicated in his favour, and Li Shimin ascended the throne. He is conventionally known by his temple name Taizong.
Although killing two brothers and deposing his father contradicted the Confucian value of filial piety, Taizong showed himself to be a capable leader who listened to the advice of the wisest members of his council. In 628, Emperor Taizong held a Buddhist memorial service for the casualties of war; in 629, he had Buddhist monasteries erected at the sites of major battles so that monks could pray for the fallen on both sides of the fight.
During the Tang campaign against the Eastern Turks, the Eastern Turkic Khaganate was destroyed after the capture of its ruler, Illig Qaghan by the famed Tang military officer Li Jing (571–649), who later became a Chancellor of the Tang dynasty. With this victory, the Turks accepted Taizong as their khagan, a title rendered as Tian Kehan in addition to his rule as emperor of China under the traditional title "Son of Heaven". Taizong was succeeded by his son Li Zhi (as Emperor Gaozong) in 649.
The Tang engaged in military campaigns against the Western Turks, exploiting the rivalry between Western and Eastern Turks in order to weaken both. Under Emperor Taizong, campaigns were dispatched in the Western Regions against Gaochang in 640, Karasahr in 644 and 648, and Kucha in 648. The wars against the Western Turks continued under Emperor Gaozong, and the Western Turkic Khaganate was finally annexed after General Su Dingfang's defeat of Khagan Ashina Helu in 657. Around this time, the Tang court enjoyed visits by numerous dignitaries from foreign lands. These were depicted in the Portraits of Periodical Offering, probably painted by Yan Liben (601–673).
Wu Zetian's usurpation
Having entered Emperor Gaozong's court as a lowly consort, Wu Zetian ultimately acceded to the highest position of power in 690, establishing the short-lived Wu Zhou. Emperor Gaozong suffered a stroke in 655, and Wu began to make many of his court decisions for him, discussing affairs of state with his councillors, who took orders from her while she sat behind a screen. When Empress Wu's eldest son, the crown prince, began to assert his authority and advocate policies opposed by Empress Wu, he suddenly died in 675. Many suspected he was poisoned by Empress Wu. Although the next heir apparent kept a lower profile, Wu accused him of plotting a rebellion in 680; he was banished and later obliged to commit suicide.
In 683, Emperor Gaozong died and was succeeded by Emperor Zhongzong, his eldest surviving son by Wu. Zhongzong tried to appoint his wife's father as chancellor: after only six weeks on the throne, he was deposed by Empress Wu in favour of his younger brother, Emperor Ruizong. This provoked a group of Tang princes to rebel in 684. Wu's armies suppressed them within two months. She proclaimed the Tianshou era of Wu Zhou on October 16, 690, and three days later demoted Emperor Ruizong to crown prince. He was also forced to give up his father's surname Li in favour of the Empress Wu. She then ruled as China's only empress regnant in history.
A palace coup (Shenlong Coup) on February 20, 705, forced Empress Wu to yield her position on February 22. The next day, her son Zhongzong was restored to power; the Tang was formally restored on March 3. She died soon after. To legitimise her rule, she circulated a document known as the Great Cloud Sutra, which predicted that a reincarnation of the Maitreya Buddha would be a female monarch who would dispel illness, worry, and disaster from the world. She even introduced numerous revised written characters for the language, though they reverted to the original forms after her death. Arguably the most important part of her legacy was diminishing the hegemony of the Northwestern aristocracy, allowing people from other clans and regions of China to become more represented in Chinese politics and government.
Emperor Xuanzong's reign
There were many prominent women at court during and after Wu's reign, including Shangguan Wan'er (664–710), a poet, writer, and trusted official in charge of Wu's private office. In 706, the wife of Emperor Zhongzong of Tang, Empress Wei (d. 710), persuaded her husband to staff government offices with his sister and her daughters, and in 709 requested that he grant women the right to bequeath hereditary privileges to their sons (which before was a male right only). Empress Wei eventually poisoned Zhongzong, whereupon she placed his fifteen-year-old son upon the throne in 710. Two weeks later, Li Longji (the later Emperor Xuanzong) entered the palace with a few followers and slew Empress Wei and her faction. He then installed his father Emperor Ruizong (r. 710–712) on the throne. Just as Emperor Zhongzong was dominated by Empress Wei, so too was Ruizong dominated by Princess Taiping. This ended when Princess Taiping's coup failed in 712, and Emperor Ruizong abdicated to Emperor Xuanzong.
The Tang reached its height during Emperor Xuanzong's 44-year reign, which has been characterized as a golden age of economic prosperity and pleasant lifestyles within the imperial court. Xuanzong was seen as a progressive and benevolent ruler, having abolished the death penalty in 747. Previously, all executions had to be approved by the emperor; in 730, there were only 24 executions. Xuanzong bowed to the consensus of his ministers on policy decisions and made efforts to staff government ministries fairly with different political factions. His staunch Confucian chancellor Zhang Jiuling (673–740) worked to reduce deflation and increase the money supply by upholding the use of private coinage, while his aristocratic and technocratic successor Li Linfu (d. 753) favoured government monopoly over the issuance of coinage. After 737, most of Xuanzong's confidence rested in Li Linfu, his long-standing chancellor, who championed a more aggressive foreign policy employing non-Chinese generals. This policy ultimately created the conditions for a massive rebellion against Xuanzong.
An Lushan rebellion and catastrophe
Previously at the height of their power, the An Lushan rebellion (755–763) ultimately destroyed the prosperity of the Tang. An Lushan was a half-Sogdian, half-Turkic Tang commander since 744, who had experience fighting the Khitans of Manchuria with a victory in 744, yet most of his campaigns against the Khitans were unsuccessful. He was given great responsibility in Hebei, which allowed him to rebel with an army of more than 100,000 troops. After capturing Luoyang, he named himself emperor of a new, but short-lived, Yan state. Despite early victories scored by the Tang general Guo Ziyi (697–781), the newly recruited troops of the army at the capital were no match for An Lushan's frontier veterans; the court fled Chang'an. While the heir apparent raised troops in Shanxi and Xuanzong fled to Sichuan, they called upon the help of the Uyghur Khaganate in 756. The Uyghur khan Moyanchur was greatly excited at this prospect, and married his own daughter to the Chinese diplomatic envoy once he arrived, receiving in turn a Chinese princess as his bride. The Uyghurs helped recapture the Tang capital from the rebels, but they refused to leave until the Tang paid them an enormous sum of tribute in silk. Even Abbasid Arabs assisted the Tang in putting down the rebellion. A massacre of foreign Arab and Persian Muslim merchants by Tian Shengong happened during the An Lushan rebellion in the 760 Yangzhou massacre. The Tibetans took hold of the opportunity and raided many areas under Chinese control, and even after the Tibetan Empire had fallen apart in 842, followed soon after by the Uyghur Kingdom of Qocho, the Tang were in no position to reconquer Central Asia after 763. So significant was this loss that half a century later jinshi examination candidates were required to write an essay on the causes of the Tang's decline. Although An Lushan was killed by one of his eunuchs in 757, this time of troubles and widespread insurrection continued until rebel Shi Siming was killed by his own son in 763.