Empress Wu Zetian — Tian Kehan

Born: 624 AD Died: 705 AD Reigned: 690 - 705 AD (effective power from c. 660 AD) Khanate: Tang Dynasty — Heavenly Qaghan Title: Tian Kehan (Heavenly Qaghan); Shengshen Huangdi (Holy and Divine Emperor)

Overview

Wu Zetian is the only woman in Chinese history to assume the title of Empress Regnant and rule in her own name, founding the short-lived Zhou dynasty (690–705 AD) while governing what had been the Tang Empire. Born Wu Zhao, she entered the imperial court as a concubine of Emperor Taizong, became the dominant consort of Emperor Gaozong, and after Gaozong's death in 683 AD progressively assumed sole power, deposing two of her own sons before formally proclaiming herself emperor in 690 AD.

Her exercise of the Tian Kehan authority — the paramount role over the steppe peoples that the Tang emperors had cultivated — is historically contested. The Tian Kehan title was bound to the Tang imperial line's prestige among the Turkic confederacies, and Wu Zetian's interruption of that line, combined with the resurgence of the Second Göktürk Khaganate under Ilterish Qaghan in 682 AD, significantly eroded Tang suzerainty over the northern steppe. Nevertheless, she exercised the functions of the Heavenly Qaghan throughout her reign, conducting diplomacy with and military campaigns against the steppe powers.

Wu Zetian was a ruler of extraordinary political skill, administrative ability, and ruthlessness. Her reign saw genuine institutional innovation, including the expansion of the examination system to broaden the bureaucratic recruitment base, alongside the political terror of her early years in power. Her legacy remains among the most debated in Chinese history.

Rise to Power

Wu Zhao entered the Tang court as a cairen — a low-ranking concubine — of Emperor Taizong at approximately age fourteen. Upon Taizong's death in 649 AD, court protocol required that imperial concubines who had borne no sons enter Buddhist convents. Wu instead became the favored consort of the new emperor Gaozong, with whom she had formed a relationship during Taizong's final illness, and was elevated to the rank of Empress in 655 AD after the politically engineered downfall of the previous empress Wang.

From 660 AD onward, as Gaozong's health declined, Wu Zetian conducted state business jointly with the emperor, sitting behind a screen during court audiences in an arrangement known as the "two sages." After Gaozong's death in 683 AD she served as empress dowager and regent, deposing her son Emperor Zhongzong within weeks of his accession and later deposing his replacement Ruizong as well. In 690 AD she declared the Tang dynasty at an end, proclaimed herself emperor of a new Zhou dynasty, and ruled openly in her own name for fifteen years until a palace coup in 705 AD forced her abdication at the age of eighty.

Rule and Achievements

• Ruled China effectively for approximately forty-five years, longer than most emperors in the dynasty's history, formally as emperor from 690–705 AD
• Expanded the imperial examination system, creating the palace examination and increasing recruitment of officials from outside the traditional aristocratic families
• Conducted successful military campaigns in Korea, Central Asia, and against the Tibetan Empire, maintaining Tang territorial claims despite the resurgence of Göktürk power
• Suppressed the rebellion of Tang prince Li Jingye in 684 AD, consolidating her control over the empire in its early phase
• Built the Mingtang — Hall of Enlightenment — in Luoyang as a ceremonial center symbolizing her universal sovereignty, drawing on both Confucian and Buddhist cosmological traditions
• Patronized Buddhism extensively, commissioning the Longmen Grottoes Vairocana Buddha and promoting Buddhist institutions as a counterweight to the Confucian establishment that resisted female rule
• Maintained functional tributary relationships with Central Asian polities and received embassies from states across the Silk Road network
• Navigated the threat of the revived Second Göktürk Khaganate through a combination of diplomacy, military containment, and strategic alliance

Legacy

Wu Zetian's place in the Qaghan tradition is paradoxical. The Tian Kehan authority she inherited was at its most structurally challenged during her reign, as the Second Göktürk Khaganate's revival directly contested Tang hegemony on the northern steppe. Yet she managed the situation with sufficient competence that the Tang — restored as a dynasty after her death — was able to rebuild its steppe relationships in the following generation under Xuanzong.

Her broader legacy is one of the most complex in premodern East Asian history. Condemned by Confucian historians for centuries as a usurper who violated the natural order, she has been reassessed by modern scholars as an exceptionally capable administrator whose institutional reforms strengthened the Tang state. The examination system she expanded became a more genuinely meritocratic institution under her stewardship. The officials she promoted through merit rather than birth produced much of the Tang's subsequent governmental talent.

Within the history of paramount authority over the steppe peoples, Wu Zetian represents a moment of discontinuity and resilience simultaneously: the Tian Kehan institution was weakened by the political turmoil she both caused and navigated, but it was not destroyed. That it could be restored under Xuanzong is in part a testament to the administrative continuity her long reign preserved.