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Xuanzong’s reign (712–756) was the high point of the Tang dynasty. It was an era of wealth and prosperity that was accompanied by institutional progress and a flowering of the arts. Political life was at first dominated by the bureaucrats recruited through the examination system who had staffed the central government under Wuhou. But a gradual revival of the power of the great aristocratic clans tended to polarize politics, a polarization that was sharpened by the emperor’s employment of a series of aristocratic specialists who reformed the empire’s finances from 720 onward, often in the teeth of bureaucratic opposition.
After 720 a large-scale re-registration of the population greatly increased the number of taxpayers and restored state control over vast numbers of unregistered families. The new household and land taxes were expanded. In the 730s the canal system, which had been allowed to fall into neglect under Wuhou and her successors, was repaired and reorganized so that the administration could transport large stocks of grain from the Yangtze region to the capital and to the armies on the northern frontiers. The south was at last financially integrated with the north. By the 740s the government had accumulated enormous reserves of grain and wealth. The tax and accounting systems were simplified, and taxes and labor services were reduced.
Some important institutional changes accompanied these reforms. The land registration, reorganization of transport, and coinage reform were administered by specially appointed commissions holding extraordinary powers, including the authority to recruit their own staff. These commissions were mostly headed by censors, and they and the censorate became centers of aristocratic power. The existence of these new offices reduced the influence of the regular ministries, enabling the emperor and his aristocratic advisers to circumvent the normal channels and procedures of administration.
After 736 the political dominance of the aristocracy was firmly reestablished. An aristocratic chief minister, Li Linfu, became a virtual dictator, his powers increasing as Xuanzong in his later years withdrew from active affairs into the pleasures of palace life and the study of Daoism. In the latter part of his reign, Xuanzong, who had previously strictly circumscribed the power of the palace women to avoid a recurrence of the disasters of Wuhou’s time and who had also excluded members of the royal family from politics, faced a series of succession plots. In 745 he fell deeply under the influence of a new favorite, the imperial concubine Yang Guifei. In 751–752 one of her relatives, Yang Guozhong, thanks to her influence with the emperor, rapidly rose to rival Li Linfu for supreme power. After Li’s death in 752 Yang Guozhong dominated the court. However, he had neither Li’s great political ability nor his experience and skill in handling people.
Military reorganization
The most important new development in Xuanzong’s reign was the growth in the power of the military commanders. During Gaozong’s reign the old militia system had proved inadequate for frontier defense and had been supplemented by the institution of permanent armies and garrison forces quartered in strategic areas on the frontiers. These armies were made up of long-service veterans, many of them non-Chinese cavalry troops, settled permanently in military colonies. Although these armies were adequate for small-scale operations, for a major campaign an expeditionary army and a headquarters staff had to be specially organized and reinforcements sent in by the central government. This cumbersome system was totally unsuitable for dealing with the highly mobile nomadic horsemen on the northern frontiers.
At the beginning of Xuanzong’s reign, the Turks again threatened to become a major power, rivaling China in Central Asia and along the borders. Kapghan (Mochuo), the Turkish khan who had invaded Hebei in the aftermath of the Khitan invasion in the time of Wuhou and had attacked the Chinese northwest at the end of her reign, turned his attention northward. By 711 he controlled the steppe from the Chinese frontier to Transoxiana and appeared likely to develop a new unified Turkish empire. When he was murdered in 716, his flimsy empire collapsed. His successor, Bilge (Pijia), tried to make peace with the Chinese in 718, but Xuanzong preferred to try to destroy his power by an alliance with the southwestern Basmil Turks and with the Khitan in Manchuria. Bilge, however, crushed the Basmil and attacked Gansu in 720. Peaceful relations were established in 721–722. Bilge’s death in 734 precipitated the end of Turkish power. A struggle among the various Turkish subject tribes followed, from which the Uighurs emerged as victors. In 744 they established a powerful empire that was to remain the dominant force on China’s northern border until 840. Unlike the Turks, however, the Uighurs pursued a consistent policy of alliance with the Tang. On several occasions Uighur aid, even though offered on harsh terms, saved the dynasty from disaster.
The Tibetans were the most dangerous foe during Xuanzong’s reign, invading the northwest annually from 714 on. In 727–729 the Chinese undertook large-scale warfare against them, and in 730 a settlement was concluded. But in the 730s fighting broke out again, and the Tibetans began to turn their attention to the Tang territories in the Tarim Basin. Desultory fighting continued on the border of Gansu until the end of Xuanzong’s reign. From 752 onward the Tibetans acquired a new ally in the Nanzhao state in Yunnan, which enabled them to exert a continuous threat along the entire western frontier.
In the face of these threats, Xuanzong organized the northern and northwestern frontiers from Manchuria to Sichuan into a series of strategic commands or military provinces under military governors who were given command over all the forces in a large region. This system developed gradually and was formalized in 737 under Li Linfu. The frontier commanders controlled enormous numbers of troops: nearly 200,000 were stationed in the northwest and Central Asia and more than 100,000 in the northeast; there were well in excess of 500,000 in all. The military governors soon began to exercise some functions of civil government. In the 740s a non-Chinese general of Sogdian and Turkish origin, An Lushan, became military governor first of one and finally of all three of the northeastern commands, with 160,000 troops under his orders. An Lushan had risen to power largely through the patronage of Li Linfu. When Li died, An became a rival of Yang Guozhong. As Yang Guozhong developed more and more of a personal stranglehold over the administration at the capital, An Lushan steadily built up his military forces in the northeast. The armed confrontation that followed nearly destroyed the dynasty.
During the 750s there was a steady reversal of Tang military fortunes. In the far west the overextended imperial armies had been defeated by the Arabs in 751 on the Talas River. In the southwest a campaign against the new state of Nanzhao had led to the almost total destruction of an army of 50,000 soldiers. In the northeast the Chinese had lost their grip on the Manchuria-Korea border with the emergence of the new state of Parhae in place of Koguryŏ, and the Khitan and Xi peoples in Manchuria constantly caused border problems. The Tibetans in the northwest were kept in check only by an enormously expensive military presence. The principal military forces were designed essentially for frontier defense.
Thus, the end of Xuanzong’s reign was a time when the state was in a highly unstable condition. The central government was dangerously dependent on a small group of men operating outside the regular institutional framework, and an overwhelming preponderance of military power was in the hands of potentially rebellious commanders on the frontiers, against whom the emperor could put into the field only a token force of his own and the troops of those commanders who remained loyal.
Late Tang (755–907)
The rebellion of An Lushan in 755 marked the beginning of a new period. At first the rebellion had spectacular success. It swept through the northeastern province of Hebei, captured the eastern capital, Luoyang, early in 756, and took the main Tang capital, Chang’an, in July of the same year. The emperor fled to Sichuan, and on the road his consort Yang Guifei and other members of the Yang faction who had dominated his court were killed. Shortly afterward the heir apparent, who had retreated to Lingwu in the northwest, himself usurped the throne. The new emperor, Suzong (reigned 756–762), was faced with a desperately difficult military situation. The rebel armies controlled the capital and most of Hebei and Henan. In the last days of his reign, Xuanzong had divided the empire into five areas, each of which was to be the fief of one of the imperial princes. Prince Yong, who was given control of the southeast, was the only one to take up his command; during 757 he attempted to set himself up as the independent ruler of the crucially important economic heart of the empire in the Huai and Yangtze valleys but was murdered by one of his generals.
An Lushan himself was murdered by a subordinate early in 757, but the rebellion continued, led first by his son and then by one of his generals, Shi Siming, and his son Shi Chaoyi; it was not suppressed until 763. The rebellion had caused great destruction and hardship, particularly in Henan. The final victory was made possible partly by the employment of Uighur mercenaries, whose demands remained a drain on the treasury well into the 770s, partly by the failure of the rebel leadership after the death of the able Shi Siming, and partly by the policy of clemency adopted toward the rebels after the decisive campaign in Henan in 762. The need for a speedy settlement was made more urgent by the growing threat of the Tibetans in the northwest. The latter, allied with the Nanzhao kingdom in Yunnan, had exerted continual pressure on the western frontier and in 763 occupied the whole of present-day Gansu. Late in 763 they actually took and looted the capital. They continued to occupy the Chinese northwest until well into the 9th century. Their occupation of Gansu signaled the end of Chinese control of the region.
Provincial separatism
The post-rebellion settlement not only pardoned several of the most powerful rebel generals but also appointed them as imperial governors in command of the areas they had surrendered. Hebei was divided into four new provinces, each under surrendered rebels, while Shandong became the province of An Lushan’s former garrison army from Pinglu in Manchuria, which had held an ambivalent position during the fighting. The central government held little power within these provinces. The leadership was decided within each province, and the central government in its appointments merely approved faits accomplis. Succession to the leadership was frequently hereditary. For all practical purposes, the northeastern provinces remained semi-independent throughout the later part of the Tang era. They had been among the most populous and productive parts of the empire, and their semi-independence was not only a threat to the stability of the central government but also represented a huge loss of revenue and potential manpower.
Provincial separatism also became a problem elsewhere. With the general breakdown of the machinery of central administration after 756, many of the functions of government were delegated to local administrations. The whole empire was now divided into provinces (dao), which formed an upper tier of routine administration. Their governors had wide powers over subordinate prefectures and counties. The new provincial governments were of two main types.
In northern China (apart from the semiautonomous provinces of the northeast, which were a special category) most provincial governments were military, their institutions closely modeled on those set up on the northern frontier under Xuanzong. The military presence was strongest in the small frontier-garrison provinces that protected the capital, Chang’an, from the Tibetans in Gansu and in the belt of small, heavily garrisoned provinces in Henan that protected China—and the canal from the Huai and Yangtze valleys, on which the central government depended for its supplies—from the semiautonomous provinces. Military governments were also the rule in Sichuan, which continued to be menaced by the Tibetans and Nanzhao, and in the far south in Lingnan.
In central and southern China, however, the provincial government developed into a new organ of the civil bureaucracy. The civil governors of the southern provinces were regularly appointed from the bureaucracy, and it became customary to appoint to these posts high-ranking court officials who were temporarily out of favor.
All the new provinces had considerable latitude of action, particularly during the reigns of Suzong and Daizong, when central power was at a low ebb. There was a general decentralization of authority. The new provinces had considerable independence in the fields of finance, local government, law and order, and military matters.
Under Daizong (reigned 762–779) the court was dominated by the emperor’s favorite, Yuan Zai, and by the eunuchs who now began to play an increasing role in Tang politics. A succession of eunuch advisers not only rivaled in influence the chief ministers but even exerted influence over the military in the campaigns of the late 750s and early 760s. Under Daizong many of the regular offices of the administration remained unfilled, while the irregularities encouraged by Yuan Zai and his clique in the appointment of officials led to an increasing use of eunuchs in secretarial posts and to their increasing dominance over the emperor’s private treasury.
The central government did achieve some success in finance. The old fiscal system with its taxes and labor services had been completely disrupted by the breakdown of authority and by the vast movements of population. The revenue increasingly came to depend on additional taxes levied on cultivated land or on property, and the government attempted to raise more revenue from the urban population. But its survival depended on the revenues it drew from central China, the Huai valley, and the lower Yangtze. Those revenues were sent to the capital by means of a reconstructed and improved canal system maintained out of the new government monopoly on salt. By 780 the salt monopoly was producing a major part of the state’s central revenues, in addition to maintaining the transportation system. The salt and transportation administration was controlled by an independent commission centered in Yangzhou, near the mouth of the Yangtze, and this commission gradually took over the entire financial administration of southern and central China.
The weak Daizong was succeeded by a tough, intelligent activist emperor, Dezong (reigned 779–805), who was determined to restore the fortunes of the dynasty. He reconstituted much of the old central administration and decided on a showdown with the forces of local autonomy. As a first step, in 780 he promulgated a new system of taxation, under which each province was assessed a quota of taxes, the collection of which was to be left to the provincial government. This was a radical measure, for it abandoned the traditional concept of head taxes levied at a uniform rate throughout the empire and also began the assessment of taxes in terms of money.
Those in the semi-independent provinces of the northeast saw this as a threat to their independence, and, when it became apparent that Dezong was determined to carry out consistently tough policies toward the northeast—reducing their armies and even denying them the right to appoint their own governors—the Hebei provinces rebelled. From 781 to 786 there was a wave of rebellions not only in the northeastern provinces but also in the Huai valley and in the area of the capital itself. These events brought the Tang even closer to disaster than had the An Lushan rising. The situation was saved because at a crucial moment the rebels fell out among themselves and because the south remained loyal. In the end, the settlement negotiated with the governors of Hebei virtually endorsed the preceding status quo, although the court made some marginal inroads by establishing two small new provinces in Hebei.
After that disaster, Dezong pursued a much more careful and passive policy toward the provinces. Governors were left in office for long periods, and hereditary succession continued. Nonetheless, the latter part of Dezong’s reign was a period of steady achievement. The new tax system was gradually enforced and proved remarkably successful; it remained the basis of the tax structure until Ming times. Revenue increased steadily, and Dezong left behind him a wealthy state. Militarily, he was also generally successful: the Tibetan threat was contained, Nanzhao was won from its alliance with the Tibetans, and the garrisons of the northwest were strengthened. At the same time, Dezong built up large new palace armies, giving the central government a powerful striking force—numbering some 100,000 soldiers by the end of his reign. Command was given to eunuchs considered loyal to the throne. The death of Dezong in 805 was followed by the brief reign of Shunzong, an invalid monarch whose court was dominated by the clique of Wang Shuwen and Wang Pei. They planned to take control of the palace armies from the eunuchs but failed.
