A Glorious Empire Crumbles: The An Lushan Rebellion and the Tang Dynasty’s Fall

The Tang Dynasty, a name that resonates as one of the most glorious eras in Chinese history. Its territory was vast, its prestige unmatched. Chang'an, the imperial capital, was hailed as a miracle of the East by merchants from Arabia, Persia, Tibet, and Sogdia. Poets like Li Bai and Du Fu sat side by side as Swirling Hu dances, the music of pipa, and gilded Buddhist pagoda spainted a vivid portrait of an open, prosperous, and culturally radiant age. But the cracks beneath this golden age began to spread in the year 755. In the year 755, the An Lushan Rebellion erupted. An Lushan, commander of the three powerful frontier commands of Fanyang, Hedong, and Pinglu, held over 100,000 elite troops under his banner. In the 11th month of the 14th year of the Tianbao era, An Lushan, along with his general Shi Siming, rose in rebellion from Fanyang. Marching under the banner of purging the emperor's court of traitors, his forces surged southward, heading straight for the eastern capital, Luoyang. Emperor Xuanzong, who had once placed complete trust in An Lushan, refused at first to believe he could betray the throne. Only when Governor Yan Zhenqing of Pingyuan sent undeniable evidence did the emperor awaken from his illusions, realizing the crisis was already beyond control. An Lushan's cavalry swept forward like a tidal wave and soon captured Luoyang. In the first month of 756, An Lushan proclaimed himself emperor in Luoyang, founding the Great Yan Dynasty, adopting the reign title Shengwu, and declaring himself the Mighty Martial Emperor. In panic and fury, Emperor Xuanzong made a disastrous decision. He executed two seasoned generals, Feng Changqing and Gao Xianji, merely for advocating a defensive stance at Tong Pass. Their unjust deaths shocked the court and shattered morale among the troops. He then ordered Geshu Han to march east from Tong Pass and take the initiative to engage the rebel forces. As feared, the Tang army suffered a catastrophic defeat at Tong Pass. Its main forces were lost and the Yan troops advanced without resistance. The capital, Chang'an, now stood perilously exposed. Emperor Xuanzong fled in haste, his entourage scattered and weary. At Mawei Slope, mutiny erupted. The soldiers slaughtered Chancellor Yang Guozhong, then turned on the emperor's beloved consort, Yang Yuhuan, cousin to Yang Guozhong, demanding her execution to forestall revenge. Under duress, Xuanzong had no choice. He ordered the eunuch Gao Lishi to strangle Lady Yang beneath a pear tree before the Buddha Hall. Only then was the army appeased. This tragic incident would be remembered as the Mawei Mutiny. After the incident, Emperor Xuanzong and Crown Prince Li Heng went their separate ways. Xuanzong continued his flight southward into Shu, while the prince turned north toward Lingwu, determined to rally the remnants of the imperial army and restore the Tang forces. Soon after, the leaderless capital of Chang'an fell. The city was ravaged, its people displaced, and the imperial palaces reduced to ashes. A mighty dynasty's heart collapsed in a single night. In 756, Li Heng declared himself Emperor in Lingwu, posthumously known as Emperor Xuanzong, while still honoring his father Xuanzong as Retired Emperor. Over the next several years, the Tang court, with the help of regional military governors, launched a hard-fought counteroffensive. Meanwhile, the rebel leadership descended into infighting and betrayal. By the year 763, the An Lushan Rebellion was finally quelled. The war had raged for eight years. Tens of millions perished. It remains one of the bloodiest civil conflicts in Chinese history. From this moment on, the Tang dynasty would decline. The brilliance of High Tang would never return.