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of victorious battles he captured Kaifeng and Luoyang where he had himself proclaimed emperor of the new dynasty of Greater Yan. His further campaigns and those of his subordinates were at first victorious; however, they then began to suffer a series of defeats at the hands of Guo Ziyi, one of China's most renowned generals, whose successes led to increased loyalist resistance to the rebel forces.
A major consequence of the rebellion of An Lushan, was the withdrawal by the emperor of his forces garrisoning the North-west thereby losing control over China's far dominions in Zungaria and the Tarim Basin [today's Xinjiang province] for the best part of the next thousand years.
For a while it seemed that the balance was turning in the emperor's favour. However, the Capital garrison at Chang'an [Xi'an] was incapable of resisting the attacks of the rebel forces and after the defeat of his main army on the banks of the Yellow River the emperor in great alarm was forced to flee Chang'an accompanied by some of his entourage. They fled west heading to Sichuan province ahead of the rebel advance. En route, at Ma Wei, his escort mutinied, killed Yang Guozhong and forced the emperor to order the Concubine Yang be strangled to pacify his discontented guards. Stories have varied but the most popular versions claim that the emperor had no choice but order her to be strangled by his chief eunuch or that she was forced to commit suicide. On reaching the safety of Chengdu, the capital of Sichuan, the heir apparent had been persuaded to usurp the throne. Weary and distressed the old emperor, now in Chengdu, gave his assent to the new reign and became the retired emperor. The new emperor bestowed the title of Taishang Huangdi
upon his father but kept him under house-arrest.
The heir-apparent made his way to Lingzhou in Gansu where he was proclaimed emperor Su Zong and was soon joined by two armies, one under Guo Ziyi. By 757 Guo had recovered the main and subsidiary capitals of Chang'an and Luoyang from the rebels, whereupon the new emperor summoned the former emperor back to Chang'an to ensure that he would not be the focus of any further intrigue and threat, where he died in 761. The father was then canonised as Zongming Huangdi
though usually he is still referred to as Ming Huang.