The An Lushan Rebellion: The Eight Years That Broke the Tang

The An Lushan Rebellion: The Eight Years That Broke the Tang

On December 16, 755, An Lushan, the Tang military governor of Pinglu, raised an army in Fanyang and led 150,000 troops south under the banner of "punishing the chancellor Yang Guozhong." At the time, Emperor Xuanzong (Li Longji) was already 70 years old, infatuated with the beauty of Yang Guifei, while court affairs had long been dominated by the Yang family and Li Linfu. The emperor who had once ushered in the glorious Kaiyuan era had no inkling that his most trusted frontier governor would rebel. The rebel forces swept southward and captured Luoyang in just one month.

The rebellion lasted eight years and was not fully put down until 763. During that time, the Tang population plummeted from roughly 53 million to 17 million, a loss of more than 30 million people. The entire country was torn apart by war. The An Lushan Rebellion was not just a military uprising but a critical turning point in Chinese history. From those eight years on, the once-mighty Tang Dynasty began its long decline, and Chinese feudal society entered the lengthy twilight of its second half.

The Fat Man Named An Lushan

An Lushan was of mixed Sogdian and Turkic heritage, born in 703 in Yingzhou. He grew up on the frontier, spoke six languages, and was a natural talent for frontier military administration. He joined the Tang frontier army at the age of 20 and rose rapidly thanks to his language skills and cunning. By his mid-thirties he was the military governor of Pinglu, in charge of the northeastern frontier defense.

Emperor Xuanzong trusted An Lushan implicitly. An Lushan visited the capital many times, dressing himself up as a clumsy and innocent fat man to flatter the emperor. He claimed Yang Guifei as his adoptive mother and bowed to her before bowing to Emperor Xuanzong every time he entered the palace. The emperor thought this fat man was utterly loyal and appointed him concurrently as military governor of Fanyang, Pinglu, and Hedong. This concentration of power gave An Lushan command of 180,000 elite troops in the northeast, making him the most dangerous figure in the empire.

The Overlooked Crisis Beneath the Golden Age

The early Kaiyuan era under Emperor Xuanzong was indeed glorious. But by the Tianbao years the situation began to change. First, the frontier governors held excessive power. To resist the nomadic peoples, the emperor had concentrated administrative, military, and fiscal power in the hands of frontier governors, effectively turning them into warlords. Second, corruption was rampant in the palace. The Yang Guifei clan occupied senior posts, and Yang Guozhong, once he became chancellor, amassed fortunes ruthlessly. Third, the equal-field system collapsed, land was concentrated, and small farmers went bankrupt en masse and became refugees.

These problems accumulated beneath the surface of prosperity. An Lushan had been preparing for five years before he raised his army in 755. He secretly expanded his forces in Fanyang, stockpiled grain and weapons, dug tunnels, and forged armor. Such large-scale preparations went undetected by the court for years, reflecting how the Tang central government had lost control over the regions. When Yang Guozhong repeatedly warned the emperor that An Lushan might rebel, the emperor instead grew displeased with Yang Guozhong, believing he was slandering a loyal official.

The Disaster at Tong Pass

After An Lushan rose in revolt in December 755, the Tang armies retreated steadily. The emperor appointed the renowned general Geshu Han to defend Tong Pass, the last barrier before Chang'an. Geshu Han believed they should hold firm and wait for the rebels' logistics to collapse. But Yang Guozhong feared Geshu Han would grow too powerful and repeatedly slandered him before the emperor, demanding that he go on the offensive.

In June 756, Emperor Xuanzong ordered Geshu Han to march out of Tong Pass and attack the rebels. This sortie became one of the greatest military catastrophes in Tang history. A 200,000-strong Tang army was ambushed at Lingbao and almost completely wiped out. Geshu Han himself was captured by the rebels. With Tong Pass lost, Chang'an was fully exposed. This decision was a joint failure of Yang Guozhong and the emperor, and it directly led to the destruction of the Yang family and the decline of the Tang Dynasty.

The Mawei Slope Mutiny

On June 14, 756, Emperor Xuanzong fled Chang'an with Yang Guifei, Yang Guozhong, Crown Prince Li Heng, and others, retreating toward Sichuan. The next day they reached Mawei Post Station. The escorting troops had not been paid for months and harbored deep resentment toward the Yang family. Chen Xuanli and other commanders launched a mutiny, first killing Yang Guozhong and then demanding the execution of Yang Guifei.

The emperor tried to protect Yang Guifei but was surrounded by the soldiers. In the end, Gao Lishi was ordered to take the 37-year-old Yang Guifei to a Buddhist chapel and strangle her with a length of white silk. The Mawei Slope mutiny was the most painful moment of the emperor's life. He fell from being emperor to a powerless old man who had lost his love and his throne. After the mutiny, Crown Prince Li Heng went north to Lingwu and proclaimed himself emperor, known in history as Emperor Suzong. Emperor Xuanzong became Retired Emperor and from then on lost all political influence. The mutiny was not only the tragedy of the Yang family but also a turning point for the Tang.

Guo Ziyi, the General Who Fought for Eight Years

The key figure in suppressing the An Lushan Rebellion was Guo Ziyi, the greatest general of the mid-to-late Tang. In 756 he raised an army from the Shuofang command and led troops south to save the dynasty. In 757 he led the recapture of Chang'an and Luoyang, enabling Emperor Suzong to return to the capital. Afterwards he repeatedly rescued the Tang Dynasty at critical moments.

But the suppression of the rebellion was extremely tortuous. An Lushan was killed by his own son An Qingxu in 757. An Qingxu was killed by Shi Siming. Shi Siming was killed by his own son Shi Chaoyi. Internal coups within the rebel forces prolonged the war for eight years. Only when Shi Chaoyi committed suicide in 763 did the rebellion officially end. Guo Ziyi was enthroned as Prince of Fenyang for his enormous merits. But he understood the danger of being too powerful, repeatedly asking to retire and to relinquish his command. This political wisdom made him the stabilizing force in Tang politics after the rebellion.

The Massive Loss of Population

The scale of population loss from the rebellion still shocks modern historians. The official Tang household registers in 755, before the war, recorded about 53 million people. By 763, after the war, the official figure had dropped to 17 million. In eight years more than 30 million people were lost. Not all were killed in direct combat; many died from displacement, plague, or famine.

Some historians argue that the figure of 30 million is exaggerated, since many people simply fled rather than died. Even by conservative estimates, however, the rebellion caused at least 15 to 20 million deaths. It is one of the largest population-loss events in ancient Chinese history, surpassed only by the great wars at the end of the Ming and the start of the Qing. From an economic perspective, recovering from such a loss took generations and irreversibly weakened the strength of the late Tang.

The Far-Reaching Impact of the An Lushan Rebellion

After the rebellion, the Tang never regained its former glory. Before 755 was the pre-rebellion Tang at its peak: the foremost empire in the world, with Chang'an as a cosmopolitan capital. After 755 came the post-rebellion Tang in decline: regional military commissioners ran their own affairs, central authority weakened, and the Tang could no longer dominate East Asia. This decline lasted until the dynasty's fall in 907.

The deeper consequence was the decline of China's overall national strength. Before the rebellion, China's GDP made up about 30% of the world total. After the rebellion this fell to 20%. The economic and cultural center of East Asia gradually shifted from the Central Plains of Chang'an and Luoyang toward Jiangnan. China entered a chaotic era of warlordism and the Five Dynasties and Ten Kingdoms, until the Song restored a unified empire. But Song China was far weaker than the Tang at its peak. The root of this decline was the eight-year An Lushan Rebellion.

The Lessons the An Lushan Rebellion Left to History

The rebellion left many lessons for later generations. The first concerns the dilemma of frontier defense under centralized rule. Giving regional commanders too much power breeds warlords; giving them too little leaves the empire unable to resist invasion. This balancing problem runs through the entire history of Chinese imperial rule. The second is the cost of court corruption. The Yang family's dominance in the late reign of Emperor Xuanzong directly set the rebellion's fuse. The price of such corruption is measured not just in money but potentially in the decline of an entire empire.

The third lesson is the real crisis beneath the appearance of prosperity. The glory of the Kaiyuan era caused the emperor and his court to underestimate latent risks, until a single rebellion blew away all that prosperity. This script repeated itself in the later Ming and Qing dynasties. For a mighty dynasty, the greatest danger is not foreign enemies but internal rot. The eight-year tragedy of the An Lushan Rebellion teaches every era's rulers that the real threats always come from within. That is the eternal warning of the rebellion in Chinese history.

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