Why the An Lushan Rebellion Was a Turning Point in Chinese History

The An Lushan Rebellion: A Turning Point in Chinese Civilization

On the ninth day of the eleventh month in 755 CE, An Lushan, the military commissioner of Fanyang, raised an army of one hundred fifty thousand troops at Fanyang under the pretext of "carrying out a secret imperial decree to punish Yang Guozhong." The iron cavalry swept southward with irresistible momentum, capturing the eastern capital of Luoyang in just thirty-five days. This eight-year conflict fundamentally altered the trajectory of Chinese history. The Tang Dynasty before this point had been an open, confident world empire with tributary states coming to pay homage; afterward, China gradually turned inward and conservative, never returning to the heights of the prosperous Tang. The An Lushan Rebellion was no ordinary insurrection—it was a profound watershed in the history of Chinese civilization.

From Enlightened Ruler to Foolish Emperor: The Decline of Tang Xuanzong

To understand the outbreak of the An Lushan Rebellion, we must first examine the transformation of Emperor Xuanzong of Tang, Li Longji. This emperor reigned for forty-four years (712–756 CE), creating the "Kaiyuan Prosperity" in the first half of his reign, yet becoming the architect of the empire's collapse in the second half.

During the Kaiyuan era (713–741 CE), Li Longji governed with diligence and determination, employing capable ministers such as Yao Chong, Song Jing, and Zhang Jiuling. He reformed the administrative system, developed the economy, and expanded the empire's territory, bringing the Tang Dynasty to its zenith. By the end of the Kaiyuan period, the national registered population reached over five million three hundred thousand, while the Chang'an capital's population exceeded one million, making it the largest and most prosperous city in the world at that time. Merchants traveled ceaselessly along the Silk Road, and envoys, traders, and students from various countries thronged Chang'an, extending Tang imperial culture's influence throughout East Asia and Central Asia.

However, upon entering the Tianbao era (742–756 CE), everything changed dramatically. At age sixty-one, Li Longji dismissed the capable prime minister Zhang Jiuling and replaced him with the treacherous and cunning Li Linfu. During his nineteen years as prime minister (734–753 CE), Li Linfu was infamous for his "honeyed words but a dagger in his heart." He eliminated rivals, silenced dissent, and suppressed both civil and military officials, transforming the imperial court into his personal tool. Most critically, to prevent frontier generals from coming to court to threaten his position as prime minister, Li Linfu actively recommended foreign-born individuals for military commissioner positions. An Lushan rose to prominence precisely under this policy.

After Li Linfu's death, his successor as prime minister, Yang Guozhong, was even more incompetent. This man was the brother of the Yang Guifei's clan and rose to power through nepotistic connections. Though mediocre in ability, he was jealous of talent and increasingly came into conflict with An Lushan, eventually becoming the direct pretext for An Lushan's rebellion.

As for Xuanzong himself, he became intoxicated with his love for Yang Guifei. "Spring nights are too brief, from now on the ruler rises late," as Bo Juyi writes in "The Song of Everlasting Sorrow"—though artistically exaggerated, the basic facts are accurate. An emperor who had once been wise and decisive, corrupted by the complacency of prolonged peace, lost his vigilance against danger. This is a tragedy that history has repeatedly enacted.

The Rise of An Lushan: The Conspiracy of Institutional Flaws and Human Greed

An Lushan's rise was the inevitable product of the evolution of Tang military institutions. Early Tang employed the fubing system, combining military service with farming—soldiers tilled the soil in peacetime and took up arms during war, with military authority firmly held by the central government. However, as territorial expansion proceeded and frontier pressures increased, the fubing system gradually collapsed, replaced by a system of recruiting soldiers. To respond to threats from the Tibetans, Turks, Khitans, and others, the Tang court established ten major military commissioners along the borders, granting them comprehensive powers over military affairs, taxation, and official appointments.

An Lushan was the greatest beneficiary of this system. Serving simultaneously as military commissioner of three regions—Fanyang, Pinglu, and Hedong—he commanded nearly two hundred thousand frontier troops and controlled vast territories in present-day Hebei, Liaoning, and northern Shanxi. These armies were hardened by campaign, well-equipped, and knew only An Lushan as their master, not the imperial court. Their salaries, promotions, and rewards all came directly from An Lushan personally.

Most fatally, the Tang court deployed its elite units in massive numbers along the frontiers, leaving the interior depleted of forces. According to historical records, in the Tianbao era frontier forces numbered approximately four hundred ninety thousand, while the central imperial guard and interior garrisons combined numbered merely eighty thousand or so, creating a dangerous situation where "the periphery was strong while the center was weak." When An Lushan rose in rebellion, encountering virtually no significant resistance from Fanyang to Luoyang, this imbalance was the underlying cause.

An Lushan himself was a skilled political opportunist adept at disguise. Before Xuanzong, he feigned loyalty and simple-mindedness, even adopting Yang Guifei as his adoptive mother and amusing the emperor with his buffoonish behavior. When officials warned Xuanzong about An Lushan's ambitions, the aging emperor dismissed their concerns. Only when the beacons of Fanyang were lit did this elderly ruler awake as if from a dream—but it was far too late.

Mawei Slope and Lingwu: The Darkest Hours of Imperial Collapse

In June 756, the rebel forces breached the Tongguan Pass, leaving Chang'an's gates wide open. Emperor Xuanzong, in panic, fled with Yang Guifei, Yang Guozhong, and a small retinue of attendants and imperial guards on the long escape route toward Sichuan.

On the fourteenth day of June, the entourage reached Mawei Post Station (present-day Xingping, Shaanxi), where the accompanying soldiers, led by General Chen Xuanli of the Longwu forces, launched a mutiny. The soldiers first killed Yang Guozhong, then demanded that Xuanzong execute Yang Guifei. The emperor resisted desperately, but persuaded by Gao Lishi, he finally ordered Yang Guifei strangled in the Buddhist hall.

"The six armies would not advance without cause, and the delicate beauty met her death before the horse," as later writers repeatedly rendered this scene. Yet beneath the tragic love story lies a deeper truth: the fragility of imperial power. A sovereign ruling millions of people could not even protect his most beloved woman. The essence of the Mawei mutiny was the army's coercion of the highest authority—a naked rehearsal of military intervention in politics.

After Mawei, Xuanzong continued his flight southward to Sichuan, while the Crown Prince Li Heng traveled north to Lingwu (present-day Lingwu, Ningxia), where he ascended the throne with the support of the Shuofang army, becoming Emperor Suzong. When father and son parted ways at that moment, the power structure of the Tang Empire shattered. The emperor's authority no longer derived from bloodline and legitimacy, but from who commanded the armies.

Eight Years of Catastrophe: From Five Million Three Hundred Thousand to One Million Seven Hundred Thousand

The An Lushan Rebellion, from its outbreak in 755 to its final suppression in 763, lasted exactly eight years. An Lushan was killed by his own son An Qingxu, who was then killed by Shi Siming, who was himself killed by his own son Shi Chaoyi. The rebel forces were rife with betrayal and bloodshed. In 763, when Shi Chaoyi was defeated and committed suicide, this catastrophe finally ended.

The destruction caused by the war was shocking. According to records in the "Old History of Tang" and "Comprehensive Institutions," in the fourteenth year of Tianbao (755 CE), the registered national population was approximately five million two hundred ninety-one thousand. By the second year of Guangde (764 CE), following the war, the registered population had plummeted to approximately one million six hundred ninety thousand. Even accounting for the statistical discrepancy caused by the large-scale evasion of household registration, the actual population losses were catastrophic. The Central Plains, especially the regions of Hebei, Henan, and the Guanzhong Plain, endured repeated ravages of back-and-forth warfare, with cities in ruins, fields lying fallow, and bones bleaching in the sun.

Du Fu, writing amid the chaos, left the most authentic records of this catastrophe. "Wine and meat reek in the halls of the rich; on the roads, corpses of the frozen poor lie heaped" and "Mountains and rivers remain, but the city is overgrown with spring grasses and trees." These immortal verses reveal the true suffering beneath—the separation and death of millions of families. His "Three Officials and Three Farewells" directly depicted war's devastation of ordinary people: old men conscripted to defend cities, newlywed wives bidding farewell to husbands, and homeless soldiers wandering in ruins.

Military Commissioners' Autonomy: A Wound That Never Healed

The deepest political consequence of the An Lushan Rebellion was the formation of military commissioners' autonomy. To suppress the rebellion, the Tang court had to appoint numerous military commissioners and grant them comprehensive local military and political authority, even rewarding rebel deserters with high offices to achieve peace. After the rebellion ended, former An-Shi forces like Tian Chengsi, Li Baozhen, and Li Huaixian were appointed military commissioners of regions like Weibo, Chengde, and Youzhou, forming the so-called "Three Hebei Commissioners."

These commissioners nominally submitted to the Tang, but in reality they levied their own taxes, appointed their own officials, and had military positions pass from father to son, becoming essentially independent kingdoms. For the next one hundred fifty years, the Tang central government and the military commissioners continued to contend, with brief periods of restored central authority like Tang Xianzong's Yuanhe Restoration (806–820 CE), but the tide was irreversible. Military commissioners' autonomy directly led to the Tang's collapse and extended into the chaotic Five Dynasties and Ten Kingdoms period.

The deeper impact was that the An Lushan Rebellion shattered the foundation of centralized imperial power and inaugurated an era of military intervention in politics. From An Lushan's rebellion to Zhao Kuangyin's "Coup of the Wineless Cup," China endured two hundred years of suffering from military warlordism. After the Tang, "using the civil to control the military" became the fundamental policy of subsequent dynasties, with its origins in the profound lessons left by the An Lushan Rebellion.

Economic Center of Gravity Shifts South: A Historical Process Accelerated by War

The An Lushan Rebellion also profoundly transformed China's economic geography. Before the rebellion, China's economic center lay in the Yellow River valley, with the Guanzhong Plain and Central Plains as the most prosperous core regions. When the chaos erupted, massive populations migrated southward from the north, bringing advanced agricultural techniques and abundant labor. The development speed of the Yangtze River and Pearl River regions accelerated dramatically.

According to scholarly research, the scale of northerner migration to the south during and after the An Lushan Rebellion may have reached several million. These migrants poured into regions like the Huai River, the Yangtze River valley, and Lingnan, promoting expanded rice cultivation, construction of water conservation projects, and prosperity of commercial towns. By the mid and late Tang period, "taxes rely upon the southeast" had become the court's consensus. Han Yu's observation that "among today's taxes from all under heaven, the Yangtze region provides nineteen-twentieths" clearly reflects the reality of economic gravity's shift southward.

This trend further accelerated during the Song Dynasty, with the economic center completely migrating south of the Yangtze by the Southern Song period. In this sense, today's relative economic prosperity of southern China compared to the north has its historical origins in the An Lushan Rebellion.

A Transformation of Civilization: From Openness to Insularity

Perhaps the profoundest impact of the An Lushan Rebellion on Chinese civilization lies in a fundamental transformation of its spiritual character.

The prosperous Tang was a rare example of an open civilization. Foreign-born peoples could serve as officials and merchants in Chang'an; foreign dances and music flourished in the court; Buddhism, Zoroastrianism, Christianity, Manichaeism, and Islam all found footing in Chang'an. Tang poetry brimmed with bold and expansive frontier sentiments: "Through a hundred golden battles in yellow sands, we shall not return till we break the northern foe" and "If only the dragon city's flying general were here, he'd not let Hunnish horses cross Yinshan." This confident and open spirit rested upon strong national power and institutional confidence.

After the An Lushan Rebellion, everything changed. An Lushan himself was a foreigner—his father was Sogdian, his mother Turkic—and his rebellion bred deep mistrust of foreigners among the Tang people. Xenophobic sentiment rose dramatically in the mid and late Tang, with tolerance for foreign cultures declining significantly. By the Song Dynasty, the "distinction between Chinese and barbarians" was elevated to an unprecedented level. Chinese civilization shifted from openness to insularity, from military prowess to cultural refinement, from confidence to caution.

This transformation cannot be simply judged as good or bad. Though militarily weak, the Song achieved brilliant accomplishments in culture, technology, and economics. The widespread application of movable type printing, gunpowder weapons, and the magnetic compass, the flourishing of Song poetry, and the construction of Neo-Confucian philosophy all occurred during this period. Yet it is undeniable that the robust, expansive, and inclusive spirit that had characterized Chinese civilization gradually receded after the An Lushan Rebellion.

How a Single Rebellion Became a Civilizational Watershed

Looking back at the An Lushan Rebellion, we discover it was far more than a simple military insurrection. It was the total explosion of multiple contradictions—institutional defects, power corruption, military imbalance—that had accumulated over long periods, and its consequences profoundly reshaped the course of Chinese history for over a millennium afterward.

Politically, it ended the golden age of centralized imperial authority and opened a long nightmare of military commissioners' autonomy and military intervention. Economically, it accelerated the southward shift of economic gravity, reshaping China's economic geography. Culturally, it pushed an open and confident civilization toward insularity and conservatism. In terms of population, it caused losses and social trauma comparable to world wars.

The greatest warning the An Lushan Rebellion offers posterity is this: an empire's decline often does not begin with external invasion, but with internal institutional corruption and power imbalance. The transformation of Emperor Xuanzong from enlightened to foolish ruler, Li Linfu's and Yang Guozhong's misgovernment, the military commissioner system's metamorphosis from defensive instrument to separatist breeding ground—each link involved someone making fateful errors, and each error pushed the empire closer to the abyss.

Standing in the flow of history looking back at that winter of 755 CE, as An Lushan's iron cavalry rolled southward, they crushed not merely the Tang's prosperous golden age, but the ending of a civilization's possibility. Afterward, China never returned to that apex when tributary states came to pay homage and all cultures were welcomed. Perhaps this is the deepest regret the An Lushan Rebellion left to Chinese history, and the fundamental reason it is called a "turning point in Chinese history."