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Emperor Taizong of Tang

Given / Temple NameLi Shimin

The Heavenly Khan who seized the throne at Xuanwu Gate and created the Zhenguan era of good rule

Holders of the Mandate · Emperors & Kings
The Zhenguan era of good ruleThe Xuanwu Gate IncidentThe Heavenly Khan

Who they are

By around twenty, Li Shimin was already the real commander of the Tang’s founding wars, capturing two kings in one stroke at Hulao Pass and settling the shape of the realm. In 626 he launched the Xuanwu Gate Incident, shooting dead the crown prince Jiancheng and Prince Yuanji and forcing his father to abdicate — entering by the bloodiest means, yet governing into the most admired era of the imperial age, the Zhenguan era of good rule. Taking the fall of Sui as his mirror, he accepted remonstrance almost to the point of self-torment (he bore Wei Zheng’s blunt objections in open court for seventeen years), lightened taxes and corvée, refined the examinations, and abroad crushed the Eastern Türks, honored by the steppe tribes as "Heavenly Khan." His exchanges with Wei Zheng were compiled into the Essentials of Government of the Zhenguan Era, the standard textbook for later emperors.

Primary sourcesOld Book of Tang, "Annals of Taizong"Zizhi Tongjian, "Chronicles of Tang"Essentials of Government of the Zhenguan Era

Key stories

The Xuanwu Gate Incident

The struggle for the succession between the heir Jiancheng and Prince Shimin had reached life and death. On the fourth of the sixth month, 626, Li Shimin laid an ambush at Xuanwu Gate with Zhangsun Wuji, Yuchi Gong, and others, shot his elder brother Jiancheng dead with his own hand, and Yuchi Gong killed Yuanji; then, in armor, he entered the palace to "protect" Emperor Gaozu. Three days later Li Shimin was made crown prince, and two months later took the throne. In old age he insisted on seeing the court historians’ record, and reading the passage on Xuanwu Gate, demanded "a straight record of the matter" — this posture of facing his own stain was itself politics.

Taking others as a mirror

Wei Zheng had been a strategist for the heir Jiancheng and had urged him to strike first and remove Li Shimin. After Xuanwu Gate, Li Shimin questioned him, and Wei Zheng answered, "Had the heir listened to me, he would not have met today’s disaster." Li Shimin did not kill but employed him, and for seventeen years thereafter Wei Zheng offered more than two hundred remonstrances, often clashing with him in open court. When Wei Zheng died, Taizong wept: "With bronze as a mirror one can straighten one’s dress; with history as a mirror one can know rise and fall; with a man as a mirror one can see gain and loss. Wei Zheng is gone, and I have lost a mirror!"

Version differences

Taizong personally read the court diaries and demanded a "straight record" of the Xuanwu Gate affair — whether the surviving accounts of the incident’s details were retouched has long been debated among historians.

Relationships

Disciple
☀️Wu Zetian　A talent-lady in his old age — the Talent Wu who would later rule in place of Tang came from his own harem
Strategist
🪞Wei Zheng

Echoes today

Below are how modern works borrow or reinterpret this name or story — not the original material. The two differ, so keep them apart.

"Taking others as a mirror"His pairing with Wei Zheng became the first symbol of the culture of accepting remonstrance in Chinese.

Appears in

The Golden Age of Sui and TangThe Xuanwu Gate Incident and the Reign of Zhenguan
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