Li Jiancheng
Encyclopedia
Li Jiancheng (589 – July 2, 626), formally Crown Prince Yin (隱太子, literally, "the hidden crown prince"), nickname Pishamen (毗沙門), was a 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....

 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...

 dynasty 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 the oldest son of the founding emperor Emperor Gaozu
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 therefore was designated crown prince after the founding of the dynasty in 618. However, although he himself was fairly capable as a general, he was overshadowed by the contributions of his younger brother 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, and the brothers contended for power for years, with Li Jiancheng aided by another younger brother, Li Yuanji
Li Yuanji
Li Yuanji , formally Prince La of Chao , more commonly known by the title of Prince of Qi , nickname Sanhu , was an imperial prince of the Chinese Tang Dynasty...

 the Prince of Qi. 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 Jiancheng was born in 589, 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 oldest 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. Duchess Dou would subsequently give birth to three of Li Jiancheng's younger brothers -- 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...

, Li Xuanba (李玄霸, who died in 614), and Li Yuanji
Li Yuanji
Li Yuanji , formally Prince La of Chao , more commonly known by the title of Prince of Qi , nickname Sanhu , was an imperial prince of the Chinese Tang Dynasty...

. She also gave birth to a sister of Li Jiancheng's, the eventual Princess Pingyang, although it was not clear whether she was older or younger than Li Jiancheng. At some point, Li Jiancheng received the title of Heir Apparent
Heir apparent
An heir apparent or heiress apparent is a person who is first in line of succession and cannot be displaced from inheriting, except by a change in the rules of succession....

 of Tang.

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 both Li Jiancheng and Li Shimin key generals, and in nine days, they captured Xihe Commandery (西河, roughly modern Lüliang
Lüliang
Lüliang is a prefecture-level city in Shanxi province in China. It has an area of 21,000 square kilometers and a population of 3,600,000.-Administration:Lüliang has direct jurisdiction over:-External links:*...

, 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....

), impressing their father. Subsequently, Li Yuan divided his forces into six armies, having Li Jiancheng and Li Shimin command three each. He also created Li Jiancheng the Duke of Longxi and Li Shimin the Duke of Dunhuang. Subsequently, Li Yuan advanced toward Chang'an, but when he got near to Hedong, his army could not advance due to torrential rains. With rumors running rampant that Liu Wuzhou and Eastern Tujue were about to attack Taiyuan, Li Yuan began ordering a retreat back to Taiyuan; it was only at Li Jiancheng's and Li Shimin's urging (that retreating back to Taiyuan would mean sure defeat) that Li Yuan changed his mind and stayed, and Li Jiancheng and Li Shimin then captured the fortress of Huoyi (霍邑, in modern Linfen
Linfen
-Administrative divisions:The prefecture-level city of Linfen is divided in one district, two cities and fourteen counties. The information here presented uses the metric system and data from 2010 Census.-Pollution:...

, 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....

), eventually convincing Li Yuan to bypass Hedong and directly advance toward Chang'an. After he crossed the Yellow River
Yellow River
The Yellow River or Huang He, formerly known as the Hwang Ho, is the second-longest river in China and the sixth-longest in the world at the estimated length of . Originating in the Bayan Har Mountains in Qinghai Province in western China, it flows through nine provinces of China and empties into...

 into Guanzhong
Guanzhong
Guanzhong , or Guanzhong Plain, is a historical region of China corresponding to the lower valley of the Wei River. It is called Guanzhong or 'within the passes' to distinguish it from 'Guandong' or 'east of the pass', that is, the North China Plain. The North China Plain is bordered on the west by...

 (i.e., the Chang'an region), he sent Li Jiancheng with Liu Wenjing (劉文靜) east to guard Tong Pass and Yongfeng Storage (永豐倉) and to stop any potential Sui reinforcements from the eastern capital 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...

. Once Li Yuan himself approached Chang'an, he summoned both Li Jiancheng and Li Shimin (whom he had sent north of the Wei River
Wei River
The Wei River is a major river in west-central China's Gansu and Shaanxi provinces. It is the largest tributary of the Yellow River and very important in the early development of Chinese civilization....

 to seize territory) to Chang'an to join him in sieging Chang'an. In winter 617, Li Yuan captured Chang'an and declared Yang You emperor (as Emperor Gong). He had himself created the Prince of Tang, become the 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...

 over Emperor Gong.

In spring 618, Li Yuan sent Li Jiancheng and Li Shimin toward Luoyang, which was then under attack by the rebel leader Li Mi the Duke of Wei, ostensibly to help Sui forces there. The Sui forces at Luoyang rejected the overture, and Li Jiancheng and Li Shimin subsequently returned to Chang'an.

Later 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. Emperor Gaozu created Li Jiancheng 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....

.

In 619, Emperor Gaozu sent Li Jiancheng to attack the agrarian leader Zhu Shanhai (祝山海) the Duke of Huxiang, and Li Jiancheng defeated Zhu. Later that year, when Li Gui
Li Gui
Li Gui , courtesy name Chuze , was the emperor of a short-lived state of Liang, which he established at the end of the Chinese Sui Dynasty. He governed the parts of modern Gansu west of the Yellow River...

 the Emperor of Liang was captured in a coup by his official An Xinggui (安興貴), who then submitted to Tang, Emperor Gaozu sent Li Jiancheng to welcome An and to escort Li Gui to Chang'an, where Emperor Gaozu executed him.

Meanwhile, Li Jiancheng was developing a reputation for leniency but favoring drinking and hunting. Emperor Gaozu, worried that he was not paying sufficient attention to the important matters of state, had the key ministers Li Gang (李綱) and Zheng Shanguo (鄭善果) join Li Jiancheng's staff.

In fall 620, believing in reports that Li Zhongwen (李仲文), who was then in charge at Taiyuan, was collaborating with Eastern Tujue, was planning to rebel, Emperor Gaozu sent Li Jiancheng to Pufan (蒲反, i.e., Hedong) to guard against Li Zhongwen, while summoning Li Zhongwen back to the capital. Li Zhongwen complied and was subsequently executed.

In spring 621, when the Xiongnu
Xiongnu
The Xiongnu were ancient nomadic-based people that formed a state or confederation north of the agriculture-based empire of the Han Dynasty. Most of the information on the Xiongnu comes from Chinese sources...

 chieftain Liu Xiancheng (劉仚成) harassed Tang's border territory, Emperor Gaozu sent Li Jiancheng to attack Liu. When Li Jiancheng subsequently captured a number of the Xiongnu, he initially released their leaders, leading them to surrender in large numbers, and he then massacred them. Only Liu escaped and fled to Liang Shidu
Liang Shidu
Liang Shidu was an agrarian leader who rebelled against the rule of the Chinese dynasty Sui Dynasty near the end of the reign of Emperor Yang of Sui...

 the Emperor of Liang. In 622, Li Jiancheng was one of the commanders that Emperor Gaozu sent, along with Li Shimin, Li Zihe (李子和), and Duan Decao (段德操), to counter an Eastern Tujue incursion.

Rivalry with Li Shimin

Meanwhile, an intense rivalry had developed between Li Jiancheng and Li Shimin, who carried the title of Prince of Qin, as while Li Jiancheng had some contributions toward Tang's reunification of China, a number of the more major contenders, including 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...

 the Emperor of Qin, 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...

 the Emperor of Zheng, and 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, were all defeated and/or captured by Li Shimin, causing him to possess the greater reputation among the army. Li Yuanji, who was also often relied on by Emperor Gaozu as a general and had been created the Prince of Qi, supported Li Jiancheng in this rivalry, and often pushed Li Jiancheng toward a more hardline position against Li Shimin, wanting to be crown prince when Li Jiancheng would become emperor. Li Jiancheng and Li Yuanji had better relations with Emperor Gaozu's favored young concubines than Li Shimin did (as their mother Duchess Dou had died before Tang's establishment), and 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.

By winter 622, 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...

 the Prince of Handong, previously a Xia general who rose against Tang after Emperor Gaozu had executed Dou Jiande, posed the only remaining major threat against Tang rule even though he had been defeated by Li Shimin earlier in the year. 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...

, who argued that Li Jiancheng needed some victories himself to establish his reputation, Li Jiancheng volunteered to command the army against Liu Heita. Emperor Gaozu thus sent Li Jiancheng, assisted by Li Yuanji. 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.

In 623, when Eastern Tujue made another incursion into Tang territory, Emperor Gaozu again sent Li Jiancheng and Li Shimin to guard against the attack. Meanwhile, 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
Fancheng
Fancheng District is a district of Xiangfan, Hubei, China.-History:Fancheng was an ancient Chinese city in Hubei, situated on the northern side of the Han River, opposite Xiangyang on the southern side of the river...

, 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, Yuchi killed Li Yuanji. 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 Jiancheng's five sons were all executed as well.

Li Jiancheng was initially posthumously reduced to commoner rank. After Emperor Taizong took the throne, he posthumously created Li Jiancheng the Prince of Xi and adopted his own son Li Fu (李福) into Li Jiancheng's line as Li Jiancheng's heir. He also buried Li Jiancheng with ceremonies due an imperial prince. In 642, he restored Li Jiancheng's crown prince title.
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