Li Yuanji
Encyclopedia
Li Yuanji (603
603
Year 603 was a common year starting on Tuesday of the Julian calendar. The denomination 603 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Europe :* Battle of Degsastan: Æthelfrith of Bernicia...

 – July 2, 626), formally Prince La of Chao (巢剌王), more commonly known by the title of Prince of Qi (齊王), nickname Sanhu (三胡), was an imperial prince of the Chinese
History of China
Chinese civilization originated in various regional centers along both the Yellow River and the Yangtze River valleys in the Neolithic era, but the Yellow River is said to be the Cradle of Chinese Civilization. With thousands of years of continuous history, China is one of the world's oldest...

 Tang Dynasty
Tang Dynasty
The Tang Dynasty was an imperial dynasty of China preceded by the Sui Dynasty and followed by the Five Dynasties and Ten Kingdoms Period. It was founded by the Li family, who seized power during the decline and collapse of the Sui Empire...

. He was a son of the dynasty's founder Emperor Gaozu of Tang
Emperor Gaozu of Tang
Emperor Gāozǔ of Táng , born Lǐ Yuān , courtesy name Shūdé , was the founder of the Tang Dynasty of China, and the first emperor of this dynasty from 618 to 626. Under the Sui dynasty, Li Yuan was the governor in the area of modern-day Shanxi, and was based in Taiyuan.In 615, Li Yuan was assigned...

 (Li Yuan), and in the intense rivalry developed between his older brothers Li Jiancheng
Li Jiancheng
Li Jiancheng , formally Crown Prince Yin , nickname Pishamen , was a crown prince of the Chinese dynasty Tang Dynasty. He was the oldest son of the founding emperor Emperor Gaozu and therefore was designated crown prince after the founding of the dynasty in 618...

 the Crown Prince
Crown Prince
A crown prince or crown princess is the heir or heiress apparent to the throne in a royal or imperial monarchy. The wife of a crown prince is also titled crown princess....

 and Li Shimin
Emperor Taizong of Tang
Emperor Taizong of Tang , personal name Lǐ Shìmín , was the second emperor of the Tang Dynasty of China, ruling from 626 to 649...

 the Prince of Qin, he sided with Li Jiancheng and often advocated drastic actions against Li Shimin, including assassination. In 626, Li Shimin, fearing that Li Jiancheng and Li Yuanji were about to kill him, laid an ambush for them at Xuanwu Gate
Incident at Xuanwu Gate
The Incident at Xuanwu Gate refers to an incident on July 2, 626, when Li Shimin the Prince of Qin, a son of Emperor Gaozu of Tang , in an intense rivalry with his older brother Li Jiancheng the Crown Prince and fearing that Li Jiancheng was about to kill him, set an ambush at Xuanwu Gate, the...

 outside the palace and killed them. Li Shimin then effectively forced Emperor Gaozu to yield the throne to him (as Emperor Taizong).

Background

Li Yuanji was born in 603, during the reign of Emperor Wen of Sui
Emperor Wen of Sui
Emperor Wen of Sui — personal name Yang Jian , Xianbei name Puliuru Jian , nickname Naluoyan — was the founder and first emperor of China's Sui Dynasty . He was a hard-working administrator and a micromanager. As a Buddhist, he encouraged the spread of Buddhism through the state...

. He was the fourth and final son of Li Yuan
Emperor Gaozu of Tang
Emperor Gāozǔ of Táng , born Lǐ Yuān , courtesy name Shūdé , was the founder of the Tang Dynasty of China, and the first emperor of this dynasty from 618 to 626. Under the Sui dynasty, Li Yuan was the governor in the area of modern-day Shanxi, and was based in Taiyuan.In 615, Li Yuan was assigned...

 the Duke of Tang, a hereditary noble, and Li Yuan's wife Duchess Dou, who was herself the daughter of Dou Yi (竇毅) the Duke of Shenwu and Northern Zhou
Northern Zhou
The Northern Zhou Dynasty followed the Western Wei, and ruled northern China from 557 to 581. It was overthrown by the Sui Dynasty.Northern Zhou's basis of power was established by Yuwen Tai, who was paramount general of Western Wei, following the split of Northern Wei into Western Wei and...

's Princess Xiangyang. He had three older brothers by Duchess Dou -- Li Jiancheng
Li Jiancheng
Li Jiancheng , formally Crown Prince Yin , nickname Pishamen , was a crown prince of the Chinese dynasty Tang Dynasty. He was the oldest son of the founding emperor Emperor Gaozu and therefore was designated crown prince after the founding of the dynasty in 618...

, Li Shimin
Emperor Taizong of Tang
Emperor Taizong of Tang , personal name Lǐ Shìmín , was the second emperor of the Tang Dynasty of China, ruling from 626 to 649...

, and Li Xuanba (李玄霸, who died in 614). She also gave birth to an older sister of Li Yuanji's, the eventual Princess Pingyang.

In 616, with agrarian rebellions beginning to engulf northern China and frequent Eastern Tujue incursions across the border, Emperor Yang of Sui
Emperor Yang of Sui
Emperor Yang of Sui , personal name Yang Guang , alternative name Ying , nickname Amo , known as Emperor Ming during the brief reign of his grandson Yang Tong), was the second son of Emperor Wen of Sui, and the second emperor of China's Sui Dynasty.Emperor Yang's original name was Yang Ying, but...

 commissioned Li Yuan to be the commander of the forces at Taiyuan
Taiyuan
Taiyuan is the capital and largest city of Shanxi province in North China. At the 2010 census, it had a total population of 4,201,591 inhabitants on 6959 km² whom 3,212,500 are urban on 1,460 km². The name of the city literally means "Great Plains", referring to the location where the Fen River...

, guarding it against both agrarian rebels and Eastern Tujue. At that time, Li Yuan took Li Shimin with him to Taiyuan, but left Li Jiancheng, Li Yuanji, another son Li Zhiyun (李智雲), and the rest of his household at Hedong (河東, in modern Yuncheng, Shanxi
Shanxi
' is a province in Northern China. Its one-character abbreviation is "晋" , after the state of Jin that existed here during the Spring and Autumn Period....

). In 617, Li Yuan, fearful that Emperor Yang might punish him for his inability to suppress the rebels led by Liu Wuzhou
Liu Wuzhou
Liu Wuzhou was a rebel leader who rose against the rule of the Chinese dynasty Sui Dynasty late in the dynasty's history, and he took imperial style -- although it was not completely clear whether the title he took was khan or tianzi...

 the Dingyang Khan, was persuaded by Li Shimin to rebel against Sui rule. He then sent secret messengers to Hedong to summon his sons and to the capital Chang'an
Chang'an
Chang'an is an ancient capital of more than ten dynasties in Chinese history, today known as Xi'an. Chang'an literally means "Perpetual Peace" in Classical Chinese. During the short-lived Xin Dynasty, the city was renamed "Constant Peace" ; yet after its fall in AD 23, the old name was restored...

 to summon his daughter and son-in-law Chai Shao
Chai Shao
Chai Shao was a Chinese military leader of the Tang Dynasty.He was the son of Chai Shen, Duke of Julu. He married the Princess Pingyang, a daughter of the Emperor Gaozu, founder of the Tang dynasty, and distinguished himself as a general against the Turkic invaders...

 (柴紹). Li Jiancheng and Li Yuanji secretly travelled to Taiyuan, but left the 13-year-old Li Zhiyun at Hedong.

Participation in Tang's founding

Even before Li Jiancheng, Li Yuanji, and Chai Shao (who, at the urging of Li Yuan's daughter, left Chang'an on his own while she went into hiding) arrived at Taiyuan, Li Yuan rebelled, declaring that he wanted to support Emperor Yang's grandson Yang You
Emperor Gong of Sui
Emperor Gong of Sui , personal name Yang You , was an emperor of the Chinese Sui Dynasty. Traditionally, he was considered the last emperor of the dynasty because he was the one who formally yielded the throne to the founding emperor to the succeeding Tang Dynasty, Emperor Gaozu of Tang ,...

 the Prince of Dai, then nominally in charge at Chang'an, as emperor
Emperor
An emperor is a monarch, usually the sovereign ruler of an empire or another type of imperial realm. Empress, the female equivalent, may indicate an emperor's wife or a woman who rules in her own right...

, while honoring Emperor Yang as Taishang Huang
Taishang Huang
Retired Emperor, Grand Emperor, or Emperor Emeritus is a title occasionally used throughout East Asian feudal regimes for former emperors who had abdicated voluntarily to their sons. This title appeared in the history of China, Japan, Korea, and Vietnam...

(retired emperor). In response, Sui officials arrested Li Zhiyun, took him to Chang'an, and executed him.

Li Yuan made Li Jiancheng and Li Shimin both key generals, but the younger Li Yuanji was not, initially, although Li Yuan created him the Duke of Guzang. When Li Yuan subsequently began his campaign toward Chang'an, he left Li Yuanji in charge at Taiyuan. Later that year, after he captured Chang'an and declared Yang You emperor (as Emperor Gong) but kept power for himself as regent
Regent
A regent, from the Latin regens "one who reigns", is a person selected to act as head of state because the ruler is a minor, not present, or debilitated. Currently there are only two ruling Regencies in the world, sovereign Liechtenstein and the Malaysian constitutive state of Terengganu...

, he created Li Yuanji the Duke of Qi and put him in charge of the 15 commanderies around Taiyuan.

In spring 618, Emperor Yang, then at Jiangdu (江都, in modern Yangzhou
Yangzhou
Yangzhou is a prefecture-level city in central Jiangsu Province, People's Republic of China. Sitting on the northern bank of the Yangtze River, it borders the provincial capital of Nanjing to the southwest, Huai'an to the north, Yancheng to the northeast, Taizhou to the east, and Zhenjiang across...

, Jiangsu
Jiangsu
' is a province of the People's Republic of China, located along the east coast of the country. The name comes from jiang, short for the city of Jiangning , and su, for the city of Suzhou. The abbreviation for this province is "苏" , the second character of its name...

), was killed in a coup led by the general Yuwen Huaji
Yuwen Huaji
Yuwen Huaji was a general of the Chinese dynasty Sui Dynasty who, in 618, led a coup against Emperor Yang of Sui, killing him. He subsequently declared Emperor Yang's nephew Yang Hao led Emperor Yang's elite Xiaoguo Army north, but was then repeatedly defeated by Li Mi, Li Shentong , and...

. When the news arrived at Chang'an, Li Yuan had Emperor Gong yield the throne to him, establishing Tang Dynasty
Tang Dynasty
The Tang Dynasty was an imperial dynasty of China preceded by the Sui Dynasty and followed by the Five Dynasties and Ten Kingdoms Period. It was founded by the Li family, who seized power during the decline and collapse of the Sui Empire...

 as its Emperor Gaozu. He created Li Yuanji the Prince of Qi.

It was said that, while he was at Taiyuan, Li Yuanji was arrogant and wasteful, and he often held military exercises with his concubines and servants, involving use of actual armor and arms, and they suffered many casualties in these exercises, including injuries to Li Yuanji himself. His wet nurse
Wet nurse
A wet nurse is a woman who is used to breast feed and care for another's child. Wet nurses are used when the mother is unable or chooses not to nurse the child herself. Wet-nursed children may be known as "milk-siblings", and in some cultures the families are linked by a special relationship of...

 Chen Shanyi (陳善意) tried to get him to change his ways, but he had his guards batter her to death. In spring 619, when his assistant Yuwen Xin (宇文歆) reported this to Emperor Gaozu, Emperor Gaozu temporarily removed him from his post. Less than a month later, however, with the people of Taiyuan petitioning to have Li Yuanji kept in charge, Emperor Gaozu restored him. (The traditional historians allege that Li Yuanji pressured the people into petitioning Emperor Gaozu.)

In summer 619, Liu Wuzhou launched an attack on the Taiyuan region, and Li Yuanji sent the general Zhang Da (張達) to resist Liu, despite Zhang's protestations that the army given him was too small to resist Liu. When Zhang was in fact defeated, he surrendered to Liu and served as Liu's guide in subsequent attacks. Liu soon put Taiyuan under siege, and while Li Yuanji initially repelled him, Liu was soon back and again had Taiyuan under siege. In fall 619, Li Yuanji fled with his wife and concubines back to Chang'an, and Liu captured Taiyuan, moving his capital from Mayi (馬邑, in modern Shuozhou
Shuozhou
Shuozhou is a city in the north of Shanxi Province in North China, located on the upper reaches of the Fen River. As of 2004, its population is approximately 1.25 million, and the city has an area of approximately 5,737 square kilometres. Administratively, Shuozhou is a prefecture-level city, with...

, Shanxi
Shanxi
' is a province in Northern China. Its one-character abbreviation is "晋" , after the state of Jin that existed here during the Spring and Autumn Period....

) there. (In 620, Li Shimin defeated Liu and recaptured the region.)

In 621, with Li Shimin leading the army in sieging Luoyang
Luoyang
Luoyang is a prefecture-level city in western Henan province of Central China. It borders the provincial capital of Zhengzhou to the east, Pingdingshan to the southeast, Nanyang to the south, Sanmenxia to the west, Jiyuan to the north, and Jiaozuo to the northeast.Situated on the central plain of...

, the capital of Wang Shichong
Wang Shichong
Wang Shichong , courtesy name Xingman , was a general of the Chinese Sui Dynasty who deposed Sui's last emperor Yang Tong and briefly ruled as the emperor of a succeeding state of Zheng...

's rival Zheng state, Li Yuanji served as Li Shimin's assistant. When subsequently another rival ruler, Dou Jiande
Dou Jiande
Dou Jiande was a leader of the agrarian rebels who rose against the rule of Emperor Yang of Sui near the end of the Chinese dynasty Sui Dynasty...

 the Prince of Xia, came to Wang's aid, Li Shimin left Li Yuanji at Luoyang to continue the siege and to watch Wang, while he himself advanced to Hulao Pass
Hulao Pass
Hulao Pass is a mountain pass northwest of Xingyang, Henan, China. It is the site of many historical battles, being the eastern guard for the capital Luoyang for several dynasties. With Mount Song to the south, the Yellow River to the north, the pass holds up a formidable defense...

 to engage Dou. Li Shimin defeated and captured Dou, and Wang, in fear, surrendered. Li Shimin received the most honors stemming from the victory, but Li Yuanji also received promotions and honors. Subsequently, when Emperor Gaozu had the government mint new coins, there were strict prohibitions against minting by any other persons, except that Li Shimin and Li Yuanji were each granted the right to have three mints and Pei Ji was granted the right to have one mint. Later that year, when Dou's general Liu Heita
Liu Heita
Liu Heita was an agrarian rebel leader during China's transition period from Sui Dynasty to Tang Dynasty, who initially successively served under Hao Xiaode , Li Mi, and Wang Shichong. He eventually followed Dou Jiande the Prince of Xia...

 rose in resistance to Tang rule and took over all of Dou's former territory, Li Shimin and Li Yuanji were sent against him. Li Shimin defeated Liu in spring 622, forcing Liu to flee to Eastern Tujue. Subsequently, they attacked another rebel leader, Xu Yuanlang
Xu Yuanlang
Xu Yuanlang was an agrarian rebel leader who rose against the rule of the Chinese dynasty Sui Dynasty late in the reign of Emperor Yang of Sui. After doing so, he did not initially claim any royal title, instead successively submitting nominally to Li Mi the Duke of Wei, Emperor Yang's grandson...

 the Prince of Lu, when Li Shimin returned to Chang'an and left Li Yuanji in charge of the operations against Xu. Meanwhile, however, Liu returned from Eastern Tujue and again occupied Dou's old territory, and Li Yuanji was not able to stop him.

Role in the rivalry between Li Jiancheng and Li Shimin

Meanwhile, an intense rivalry had developed between Li Jiancheng, who as the oldest son was Emperor Gaozu's crown prince
Crown Prince
A crown prince or crown princess is the heir or heiress apparent to the throne in a royal or imperial monarchy. The wife of a crown prince is also titled crown princess....

, and Li Shimin, as Li Jiancheng, while a capable general himself, was overshadowed by Li Shimin, who had done much to solidify Tang rule by destroying Liu Wuzhou, Wang Shichong, Dou Jiande, and Xue Rengao
Xue Rengao
Xue Rengao , also known as Xue Renguo , was an emperor of the short-lived state of Qin, established by his father Xue Ju at the end of the Chinese dynasty Sui Dynasty...

. Li Yuanji supported Li Jiancheng in this rivalry, as he believed that if Li Jiancheng became emperor, Li Jiancheng would create him crown prince. Since their mother Duchess Dou had died in 614, the fact that Li Jiancheng and Li Yuanji had better relations with Emperor Gaozu's favored young concubines than Li Shimin did take a notable importance, since those concubines helped rehabilitate Li Jiancheng's standing before Emperor Gaozu, causing him to no longer consider making Li Shimin crown prince instead, as he considered at one point.

After Liu Heita returned from Eastern Tujue and reoccupied old Xia territory, Li Jiancheng, at the suggestion of his staff members Wang Gui
Wang Gui
Wang Gui , courtesy name Shujie , formally Duke Yi of Yongning , was a chancellor during the reign of Emperor Taizong of Tang...

 and Wei Zheng
Wei Zheng
Wei Zheng , courtesy name Xuancheng , formally Duke Wenzhen of Zheng , was a Chinese politician and the lead editor of the Book of Sui, composed in 636...

, volunteered to lead the army against Liu. Emperor Gaozu thus sent Li Jiancheng, assisted by Li Yuanji, against Liu. Around the new year 623, with Liu's forced bogged down while attacking Tang's Wei Prefecture (魏州, in modern Handan
Handan
Handan is a prefecture-level city located in the southwestern part of Hebei Province of China.- History :Handan was the capital of the State of Zhao during the Warring States period , after the capital moved from Zhongmu. The city was conquered by the State of Qin after the virtual annexation of...

, Hebei
Hebei
' is a province of the People's Republic of China in the North China region. Its one-character abbreviation is "" , named after Ji Province, a Han Dynasty province that included what is now southern Hebei...

), Li Jiancheng and Li Yuanji engaged him at Guantao (館陶, in modern Handan as well), crushing him. Liu fled north toward Eastern Tujue, but was ambushed and captured by his own official Zhuge Dewei (諸葛德威), who delivered him to Li Jiancheng. Li Jiancheng executed Liu. China was by this point almost completely unified by Tang. At one point, Li Yuanji tried to persuade Li Jiancheng to have Li Shimin assassinated when Li Shimin was visiting Li Yuanji's mansion, but Li Jiancheng, not having the heart to kill a brother, stopped Li Yuanji from doing so.

In 624, Li Jiancheng requisitioned a number of soldiers from the general Li Yi
Luo Yi
Luo Yi , known during service to Tang Dynasty as Li Yi , courtesy name Ziyan or Ziting , was a Sui Dynasty official who rose against the rule of Emperor Yang of Sui and occupied the modern Beijing region. He subsequently submitted to Emperor Gaozu of Tang and was created the Prince of Yan and...

 the Prince of Yan, to supplement his guard corps, against Emperor Gaozu's regulations. When this was revealed to Emperor Gaozu, Emperor Gaozu rebuked Li Jiancheng and exiled his guard commander Keda Zhi (可達志). When, subsequently, Li Jiancheng nevertheless requested the commandant at Qing Prefecture (慶州, in modern Qingyang
Qingyang
Qingyang is a prefecture-level city in China's Gansu province.-Geography and climate:Qingyang is in eastern Gansu province and is sometimes referred to in Chinese as "Longdong" . Ningxia province is to the north west and Shaanxi is to the east. It is in the lower middle part of the Yellow River on...

, Gansu
Gansu
' is a province located in the northwest of the People's Republic of China.It lies between the Tibetan and Huangtu plateaus, and borders Mongolia, Inner Mongolia, and Ningxia to the north, Xinjiang and Qinghai to the west, Sichuan to the south, and Shaanxi to the east...

), Yang Wen'gan (楊文幹), to conscript troops, presumably to guard against Li Shimin, the officers Erzhu Huan (爾朱煥) and Qiao Gongshan (橋公山) informed Emperor Gaozu that Li Jiancheng was encouraging Yang to start a rebellion so that they could seize power together. Emperor Gaozu, then at Renzhi Palace (仁智宮, in modern Tongchuan, Shaanxi
Shaanxi
' is a province in the central part of Mainland China, and it includes portions of the Loess Plateau on the middle reaches of the Yellow River in addition to the Qinling Mountains across the southern part of this province...

), was incensed, and summoned Li Jiancheng, then at Chang'an, to Renzhi Palace. Li Jiancheng briefly flirted the idea of occupying Chang'an and not accepting the order, but eventually reported to Renzhi Palace to request forgiveness. Emperor Gaozu put him under arrest. When Yang heard this, Yang rebelled, and Emperor Gaozu, after promising Li Shimin that he would be made crown prince, sent Li Shimin to attack Yang. (Under Emperor Gaozu's promise, Li Jiancheng would be removed as crown prince and created the Prince of Shu instead. He would then send Li Jiancheng to the modern Sichuan
Sichuan
' , known formerly in the West by its postal map spellings of Szechwan or Szechuan is a province in Southwest China with its capital in Chengdu...

 region.) Once Li Shimin left, however, Li Yuanji, Emperor Gaozu's concubines, and the chancellor
Chancellor
Chancellor is the title of various official positions in the governments of many nations. The original chancellors were the Cancellarii of Roman courts of justice—ushers who sat at the cancelli or lattice work screens of a basilica or law court, which separated the judge and counsel from the...

 Feng Deyi
Feng Deyi
Feng Deyi , formal name Feng Lun but went by the courtesy name of Deyi, formally initially Duke Ming of Mi , later Duke Miao of Mi , was an official of the Chinese dynasty Sui Dynasty and Tang Dynasty who served as a chancellor during the reigns of Emperor Gaozu of Tang and Emperor Taizong of Tang...

, all spoke on Li Jiancheng's behalf, and Emperor Gaozu changed his mind, released Li Jiancheng, and allowed him to return to Chang'an and remain as crown prince. Instead, Emperor Gaozu only blamed the discord between his sons on Li Jiancheng's staff members Wang Gui and Wei Ting (韋挺), and Li Shimin's staff member Du Yan
Du Yan
Du Yan , courtesy name Zhili , formally Duke Xiang of Anji , was a chancellor during the reign of Emperor Taizong of Tang. His more famous nephew Du Ruhui was also a chancellor.- During Sui Dynasty :...

, exiling them. Yang was subsequently assassinated by his own subordinates.

Later that year, Emperor Gaozu, troubled by repeated Eastern Tujue incursions, seriously considered burning Chang'an to the ground and moving the capital to Fancheng (樊城, in modern Xiangfan
Xiangfan
Xiangyang is a prefecture-level city in Hubei Province of the People's Republic of China. It was formed from two famous ancient cities, Xiangyang and Fancheng...

, Hubei
Hubei
' Hupeh) is a province in Central China. The name of the province means "north of the lake", referring to its position north of Lake Dongting...

), a suggestion that Li Jiancheng, Li Yuanji, and the chancellor Pei Ji agreed with. Li Shimin opposed, however, and the plan was not carried out. Meanwhile, Li Shimin himself was sending his confidants to Luoyang to build up personal control of the army there. After an incident in which Li Shimin suffered a severe case of food poisoning after feasting at Li Jiancheng's palace -- an event that both Emperor Gaozu and Li Shimin apparently interpreted as an assassination attempt -- Emperor Gaozu considered sending Li Shimin to guard Luoyang to prevent further conflict, but Li Jiancheng and Li Yuanji, after consulting each other, believed that this would only give Li Shimin an opportunity to build up his personal power there, and therefore opposed it. Emperor Gaozu therefore did not carry out the plan.

Death

By 626, Li Shimin was fearful that he would be killed by Li Jiancheng, and his staff members Fang Xuanling
Fang Xuanling
Fang Xuanling , formal name Fang Qiao but went by the courtesy name of Xuanling, formally Duke Wenzhao of Liang , was the lead editor of the Book of Jin and one of the most celebrated chancellors of the Chinese dynasty Tang Dynasty, and he and his colleague Du Ruhui, both serving during the reign...

, Du Ruhui
Du Ruhui
Du Ruhui , courtesy name Keming , formally Duke Cheng of Lai , was one of the most celebrated chancellors of the Chinese dynasty Tang Dynasty, and he and his colleague Fang Xuanling, both serving during the reign of Emperor Taizong, were often asserted to be ideal models for chancellors.- During...

, and Zhangsun Wuji
Zhangsun Wuji
Zhangsun Wuji , courtesy name Fuji , formally Duke of Zhao , was a chancellor of the Chinese dynasty Tang Dynasty during the reigns of his brother-in-law Emperor Taizong and nephew Emperor Gaozong...

 were repeatedly encouraging Li Shimin to attack Li Jiancheng and Li Yuanji first -- while Wei Zheng was encouraging Li Jiancheng to attack Li Shimin first. Li Jiancheng persuaded Emperor Gaozu to remove Fang and Du, as well as Li Shimin's trusted guard officers Yuchi Jingde
Yuchi Jingde
Yuchi Jingde , formal name Yuchi Gong but went by the courtesy name of Jingde, formally Duke Zhongwu of E , was a general of the Chinese dynasty Tang Dynasty whose bravery later caused him to be incorporated into Chinese folk religion as a door god, along with Qin Shubao.-During Sui Dynasty:Yuchi...

 and Cheng Zhijie (程知節), from Li Shimin's staff. Zhangsun, who remained on Li Shimin's staff, continued to try to persuade Li Shimin to attack first.

In summer 626, Eastern Tujue was making another attack, and under Li Jiancheng's suggestion, Emperor Gaozu, instead of sending Li Shimin to resist Eastern Tujue as he first was inclined, decided to send Li Yuanji instead. Li Yuanji was given command of much of the army previously under Li Shimin's control, further troubling Li Shimin, who believed that with the army in Li Yuanji's hands, he would be unable to resist an attack. Li Shimin had Yuchi summon Fang and Du back to his mansion secretly, and then on one night submitted an accusation to Emperor Gaozu that Li Jiancheng and Li Yuanji were committing adultery with Emperor Gaozu's concubines. Emperor Gaozu, in response, issued summonses to Li Jiancheng and Li Yuanji for the next morning, convening the senior officials Pei Ji, Xiao Yu
Xiao Yu
Xiao Yu , courtesy name Shiwen , formally Duke Zhenbian of Song , was an imperial prince of the Chinese dynasty Liang Dynasty who later became an official for Sui Dynasty and Tang Dynasty, serving as a chancellor at times during the reigns of Emperor Gaozu of Tang and Emperor Taizong of Tang.-...

, and Chen Shuda
Chen Shuda
Chen Shuda , courtesy name Zicong , formally initially Duke Miao of Jiang , later Duke Zhong of Jiang , was an imperial prince of the Chinese dynasty Chen Dynasty, who, after Chen's destruction, served as an official for the succeeding Sui Dynasty and Tang Dynasty, becoming a chancellor during the...

 to examine Li Shimin's accusations. As Li Jiancheng and Li Yuanji approached the central gate leading to Emperor Gaozu's palace, Xuanwu Gate (玄武門), Li Shimin carried out the ambush he had set. He personally fired an arrow that killed Li Jiancheng. Subsequently, Li Yuanji tried to kill Li Shimin, but Yuchi killed Li Yuanji instead during the struggle. Li Shimin's forces entered the palace and, under the intimidation of Li Shimin's forces, Emperor Gaozu agreed to create Li Shimin crown prince, and two months later passed the throne to him (as Emperor Taizong). Li Yuanji's five sons were all executed as well. Emperor Taizong also took Li Yuanji's wife Princess Yang as a concubine.

Li Yuanji was initially posthumously reduced to commoner rank. After Emperor Taizong took the throne, he posthumously created Li Yuanji the Prince of Hailing, with the unflattering posthumous name
Posthumous name
A posthumous name is an honorary name given to royalty, nobles, and sometimes others, in East Asia after the person's death, and is used almost exclusively instead of one's personal name or other official titles during his life...

of La (meaning "ungrateful"). In 642, Emperor Taizong changed Li Yuanji's posthumous title to the greater title of Prince of Chao, and adopted his own son, by Consort Yang (Li Yuanji's widow), Li Ming (李明) the Prince of Cao (note difference in title) into Li Yuanji's line, as Li Yuanji's heir.
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