Emperor Xuanzong of Tang (;"Xuan Zong". Collins English Dictionary. 8 September 685General note: Dates given here are in the Julian calendar. They are not in the proleptic Gregorian calendar. – 3 May 762), personal name Li Longji, was an emperor of the Tang dynasty of China, reigning from 712 to 756. His reign of 44 years was the longest during the Tang dynasty. Through two palace coups, he seized the throne and inherited an empire still in its golden age. He was initially assisted by capable chancellors like Yao Chong, Song Jing and Zhang Yue who were already serving as government officials before Xuanzong ascended the throne. Under Emperor Xuanzong, the empire reached its turning point and went into sharp decline and near collapse, due to political missteps, such as over-trusting chancellors Li Linfu, Yang Guozhong and general An Lushan, with Tang's golden age ending in the An Lushan rebellion.See, e.g., Bo Yang Edition of the Zizhi Tongjian, vol. 52, preface.
Background
Li Longji was born at the Tang dynasty eastern capital Luoyang in 685, during the first reign of his father Emperor Ruizong (Li Dan) – but at that time, Emperor Ruizong's mother Empress Dowager Wu (later known as Wu Zetian), not Emperor Ruizong, was in actual control of power as empress dowager and regent. Li Longji was the third son of Emperor Ruizong, and his mother was Emperor Ruizong's concubine Consort Dou, who was highly ranked in the bureaucracy. In 687, as the emperor's son, he was created the Prince of Chu. It was said that he was handsome, with an appearance that was "majestic and beautiful", and was talented in music.Old Book of Tang, vol. 8. He had two older brothers – Li Chengqi, born of Emperor Ruizong's wife Empress Liu, and Li Chengyi (), as well as three younger brothers – Li Longfan (), Li Longye (), and Li Longti (). He had two full younger sisters, Princess Jinxian () and Princess Yuzhen (), who later became Taoist nuns.New Book of Tang, vol. 81.
During Wu Zetian's reign In 690, Empress Dowager Wu had her son Emperor Ruizong yield the throne to her, and she took the throne as empress regnant of a new Zhou dynasty, interrupting Tang. She imposed upon Ruizong and his family the surname Wu () to match hers. In 692, Li Longji and his brothers were allowed to have residences outside the palace and were given staffs at their mansions. In 693, both his mother Consort Dou and Li Dan's wife Crown Princess Liu (Li Dan's having been reduced to crown prince rank at that point) were killed by Wu Zetian inside the palace after Wu Zetian's lady-in-waiting Wei Tuan'er () falsely accused them of using witchcraft against Wu Zetian – and not even their bodies were recovered.Zizhi Tongjian, vol. 205. Subsequently, all of Li Dan's sons were reduced in title, and Li Longji's title was reduced to Prince of Linzi. He and his brothers, along with their cousins Li Guangshun () the Prince of Yifeng, Li Shouli the Prince of Yong, and Li Shouyi () the Prince of Yong'an (the sons of their uncle Li Xián, formerly crown prince but who had been forced by Wu Zetian to commit suicide in 684), were kept inside the palace and not allowed to have contact with outsidersZizhi Tongjian, vol. 204, until 699, when they were allowed to leave the palace and take up residences outside.Zizhi Tongjian, vol. 206.
During Emperor Zhongzong's second reign: under Empress Wei's shadow In 705, Wu Zetian was overthrown in a coup (), and Li Longji's uncle Li Xiǎn (note different person than the father of Li Guangshun, Li Shouli, and Li Shouyi), who was at that time crown prince (Li Dan having yielded that title to him in 698 and taken the title of Prince of Xiang), who had been briefly emperor prior to Li Dan, returned to the throne (as Emperor Zhongzong). Li Longji was made the deputy minister of military supplies (衛尉少卿, Weiwei Shaoqing). In 708, he was made the secretary general of Lu Prefecture (潞州, roughly modern Changzhi, Shanxi). In 710, he was recalled to the capital Chang'an to attend to Emperor Zhongzong when Emperor Zhongzong was sacrificing to heaven and earth. Meanwhile, sorcerers engaged by Emperor Zhongzong believed that there was an aura of an emperor at the area of Chang'an where the mansions Li Longji and his uncles were, and Emperor Zhongzong tried to fulfill the vision by visiting Li Longji's mansion and attending a feast there. While Li Longji was back in Chang'an, he spent time to cultivate relationships with imperial guard commanders, as he believed that Emperor Zhongzong's powerful wife Empress Wei, who was in charge of government affairs, would bring harm to the Tang dynasty.Zizhi Tongjian, vol. 209.
Coup against Empress Dowager Wei In summer 710, Emperor Zhongzong died suddenly—a death that traditional historians believed to be a poisoning by Empress Wei and her daughter Li Guo'er the Princess Anle so that Empress Wei could become "emperor" like Wu Zetian and Li Guo'er could become crown princess. For the time being, Emperor Zhongzong's son by a concubine, Li Chongmao the Prince of Wen, was named emperor (as Emperor Shang), but Empress Wei retained actual power as empress dowager and regent. Originally, Empress Dowager Wei's clan members, along with Zong, Li Guo'er's husband Wu Yanxiu, and other officials Zhao Lüwen () and Ye Jingneng () were advising her to take the throne, like Wu Zetian did, and they also advised her to eliminate Li Dan and Princess Taiping. The official Cui Riyong leaked their plan to Li Longji. Li Longji responded by conspiring with Princess Taiping, Princess Taiping's son Xue Chongjian (), as well as several low-level officials close to him—Zhong Shaojing, Wang Chongye (), Liu Youqiu, and Ma Sizong ()—to act first. Meanwhile, Empress Wei's nephews Wei Bo () and Gao Song (), who had recently been put in command of imperial guards and who had tried to establish their authority by dealing with the guards harshly, had alienated the guards, and the guard officers Ge Fushun (), Chen Xuanli (), and Li Xianfu () thereafter also joined the plot.
Without first informing Li Dan, the conspirators enacted their plan on 21 July 710, first killing Wei Bo, Gao, and Empress Wei's cousin Wei Gui (). They then began their attack on the palace, causing Empress Dowager Wei to flee to an imperial guard camp, where a guard beheaded her. Li Guo'er, Wu Yanxiu, and Lady Helou were killed as well. Li Longji soon slaughtered a number of officials in Empress Dowager's faction as well as her clan, while displaying Empress Dowager Wei's body on the street. At the urging of Princess Taiping, Li Longji, and Li Longji's brother Li Chengqi, Li Dan soon took the throne from Li Chongmao and again became emperor (as Emperor Ruizong).
During Emperor Ruizong's second reign: under Princess Taiping's shadow
Emperor Ruizong once again ascended to the throne, which is different from the first time he was a puppet. This time he truly mastered the power and quickly used it handily. Emperor Ruizong was immediately faced with the issue of whom to make crown prince—as Li Chengqi, as the oldest son overall and the oldest son of his wife, was the appropriate heir under Confucian principles of succession, but Li Longji had been the one whose accomplishments had allowed him to retake the throne. He hesitated. Li Chengqi declined consideration to be crown prince—stating to his father:
Li Chengqi wept and begged to yield for several days, and after further persuasion by the chancellor Liu Youqiu—who had been part of Li Longji's coup plans—Emperor Ruizong agreed and created Li Longji crown prince. Li Longji submitted a petition offering to yield to Li Chengqi, but Emperor Ruizong rejected it. After he came to the throne, whenever the chancellors and officials discussed political affairs with him, the first sentence he asked was: "Have you ever discussed with Princess Taiping? "If the answer is yes, he will continue to ask: "Have you ever discussed with Li Longji?" If both people have clear opinions, he will make a decision based on this, as a result, he relies heavily on Princess Taiping and Li Longji. Because of his achievements, having the crown prince title and the emperor's trust, Li Longji was active and powerful in the politics of Emperor Ruizong's reign, but, also, whenever Emperor Ruizong called a court meeting, Princess Taiping would listen to the courtiers' conversations with the emperor about the government behind a pearl curtain and had the government under her hands.
Under her ample reputation in the previous reigns, her great achievements in two coups, the trust of Emperor Ruizong's, the vast privileges, attention, independence and wealth that Emperor Ruizong bestowed on her, and having countless allies, Princess Taiping has decision-making power on many serious events in the court and the country matters and was so powerful that she even surpassed Emperor Ruizong. She could often decide the promotion or demotion, deportation or summons of officials with a single sentence, and if the subject was undecided, it was changed or determined by a sentence from her, so most chancellors, forbidden troops, civil and military officials, regional warlords and senior servants of the Imperial palace were her associates. Initially, Princess Taiping agreed to Li Longji's ascension as crown prince despite the fact that Li Longji was not Emperor Ruizong's oldest son and was not born of Emperor Ruizong's wife Empress Liu (Li Chengqi was both—and therefore pursuant to Confucian principles of succession should have been crown prince) as she believed that Li Longji was young (25 at the time he was made crown prince) and would be easy to control. However, once she began to see that Li Longji was strong-willed and criticized her influences, she became apprehensive and often had officials close to her publicly opine that Li Longji was an improper crown prince. She even spread rumors throughout the empire and tried to cause discontent among the common people, saying: Li Longji is not the eldest son of the emperor, so he should not become the crown prince. She further often paid Li Longji's staff members to spy on him to try to find faults with him. She associated with a group of officials, including the chancellors Dou Huaizhen, Xiao Zhizhong, and Cen Xi, intending to find some way to remove Li Longji, but was unable to get two other chancellors—Wei Anshi and Song Jing—to join her group. When Princess Taiping tried to depose Li Longji in two actions, one with Emperor Ruizong himself and another time by summoning the chancellors at Xuanwu Gate and publicly accusing Li Longji of treason or incompetence, but it did not achieve the desired result.Zizhi Tongjian, vol. 210.