Early Tang
Foundations of Power

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The temple name of Li Shimin, second emperor of the Tang dynasty. Widely regarded as one of China's most capable rulers, he is credited with consolidating Tang power, reforming the bureaucracy, and establishing Tang as the dominant force in East Asia. His reign is often called the "Reign of Zhenguan" and held up as a model of benevolent rule — even though it began with fratricidal coup.

The palace coup in which Li Shimin ambushed and killed his two brothers — Crown Prince Li Jiancheng and Prince Li Yuanji — at the Xuanwu (Black Tortoise) Gate of the imperial palace in Chang'an. Li Shimin then had all ten of his nephews executed the same day. His father, Emperor Gaozu (Li Yuan), abdicated two months later. Official Tang histories, compiled under Taizong's oversight, portrayed the coup as a defensive response to his brothers' plotting — a self-serving account historians treat with skepticism.

The central administrative framework of the Tang government. The Secretariat (中書省) drafted imperial edicts and policy proposals; the Chancellery (門下省) reviewed and could reject them; the Department of State Affairs (尚書省) implemented approved policies through the Six Ministries. By separating drafting, review, and execution, the system structurally prevented any single minister from monopolizing power — a key institutional legacy adopted across East Asia.

The "Illuminating the Classics" examination, which tested candidates' memorization and comprehension of the Confucian canon. It was considered easier than the Jinshi and carried less prestige, though it opened government careers to a wider pool of candidates. Passing the Mingjing signaled mastery of classical learning but not the literary flair that Tang elites most prized.

"Presented Scholar" — the most prestigious of the Tang civil service examinations. It tested literary composition (including poetry), policy essays, and classical learning. The Jinshi degree was extremely difficult to pass (only a few dozen candidates succeeded each year) and conferred enormous social prestige. Jinshi graduates formed an increasingly important pool from which top officials were drawn, gradually displacing the old hereditary aristocracy over the course of the Tang and Song dynasties.

A military system in which peasant-soldiers cultivated land during peacetime and served in military rotation when called up. Fubing soldiers were expected to supply their own weapons, horses, and provisions, making the system relatively inexpensive for the state. The fubing system was closely linked to the equal-field land allocation system; when large landlords began absorbing peasant lands in the mid-Tang, fubing soldiers lost their land base and the system collapsed, requiring the state to shift to expensive professional armies.

A powerful confederation of Turkic-speaking nomadic peoples that dominated the Eurasian steppe from the mid-6th century onward. At their height, the Türk Khaganate stretched from Manchuria to the Black Sea. They split into Eastern and Western factions, both of which posed serious threats to Sui and early Tang China. After Taizong defeated the Eastern Turks in 630, many Turks were absorbed into Tang armies and administration, contributing to the dynasty's multi-ethnic character — and eventually to its destabilization.

One of the Three Kingdoms of Korea, occupying the southeastern portion of the peninsula. Silla allied with Tang China against its rivals Baekje and Goguryeo in the 660s–668 CE. After the Tang-Silla alliance conquered both kingdoms, Silla turned against Tang and expelled Chinese forces from the peninsula by 676 CE, establishing the first unified Korean state. The episode illustrates how Tang's peripheral allies could use the empire's resources for their own ends.

Chang'an was divided into 108 rectangular residential and commercial wards, each surrounded by its own earthen wall with gates that were locked each night at the sound of a drum. The ward system allowed the government to monitor and control movement within the city, separate social classes, and restrict nighttime activity. Markets were confined to two designated ward areas. The rigid grid layout of Chang'an became the model for capital cities across East Asia, including Nara and Kyoto in Japan.

Nestorianism (known in China as 景教, Jǐngjiào — "Luminous Religion") was a form of Christianity that spread along the Silk Road from the Near East into Central Asia and China. A famous stele erected in Chang'an in 781 CE records the arrival of Nestorian missionaries in 635 CE and documents a community that flourished under Tang patronage. The Tang court's tolerance of Nestorian Christianity alongside Zoroastrianism, Manichaeism, Buddhism, Daoism, and Islam illustrates the cosmopolitan character of Chang'an as a truly international city.