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Kangxi Emperor's reign and consolidation

The sixty-one year reign of the Kangxi Emperor was the longest of any emperor of China and marked the beginning of the " High Qing " era, the zenith of the dynasty's social, economic and military power. The early Manchu rulers established two foundations of legitimacy that help to explain the stability of their dynasty. The first was the bureaucratic institutions and the neo-Confucian culture that they adopted from earlier dynasties. Manchu rulers and Han Chinese scholar-official elites gradually came to terms with each other. The examination system offered a path for ethnic Han to become officials. Imperial patronage of Kangxi Dictionary demonstrated respect for Confucian learning, while the Sacred Edict of 1670 effectively extolled Confucian family values. His attempts to discourage Chinese women from foot binding, however, were unsuccessful.

The second major source of stability was the Inner Asian aspect of their Manchu identity, which allowed them to appeal to the Mongol, Tibetan and Muslim subjects. The Qing used the title of Emperor (Huangdi or hūwangdi) in Chinese and Manchu (along with titles like the Son of Heaven and Ejen), and among Tibetans the Qing emperor was referred to as the " Emperor of China " (or "Chinese Emperor") and "the Great Emperor" (or "Great Emperor Manjushri "), such as in the 1856 Treaty of Thapathali, while among Mongols the Qing monarch was referred to as Bogda Khan or "(Manchu) Emperor", and among Muslim subjects in Inner Asia the Qing ruler was referred to as the "Khagan of China" (or " Chinese khagan "). The Qianlong Emperor portrayed the image of himself as a Buddhist sage ruler, a patron of Tibetan Buddhism in the hope to appease the Mongols and Tibetans. The Kangxi Emperor also welcomed to his court Jesuit missionaries, who had first come to China under the Ming.

Kangxi's reign started when he was seven years old. To prevent a repeat of Dorgon's monopolizing of power, on his deathbed his father hastily appointed four regents who were not closely related to the imperial family and had no claim to the throne. However, through chance and machination, Oboi, the most junior of the four, gradually achieved such dominance as to be a potential threat. In 1669 Kangxi, through trickery, disarmed and imprisoned Oboi – a significant victory for a fifteen-year-old emperor.

The young emperor faced challenges in maintaining control of his kingdom, as well. Three Ming generals singled out for their contributions to the establishment of the dynasty had been granted governorships in Southern China. They became increasingly autonomous, leading to the Revolt of the Three Feudatories, which lasted for eight years. Kangxi was able to unify his forces for a counterattack led by a new generation of Manchu generals. By 1681, the Qing government had established control over a ravaged southern China, which took several decades to recover.

To extend and consolidate the dynasty's control in Central Asia, the Kangxi Emperor personally led a series of military campaigns against the Dzungars in Outer Mongolia. The Kangxi Emperor expelled Galdan 's invading forces from these regions, which were then incorporated into the empire. Galdan was eventually killed in the Dzungar–Qing War. In 1683, Qing forces received the surrender of Formosa (Taiwan) from Zheng Keshuang, grandson of Koxinga, who had conquered Taiwan from the Dutch colonists as a base against the Qing. Winning Taiwan freed Kangxi's forces for a series of battles over Albazin, the far eastern outpost of the Tsardom of Russia. The 1689 Treaty of Nerchinsk was China's first formal treaty with a European power and kept the border peaceful for the better part of two centuries. After Galdan's death, his followers, as adherents to Tibetan Buddhism, attempted to control the choice of the next Dalai Lama. Kangxi dispatched two armies to Lhasa, the capital of Tibet, and installed a Dalai Lama sympathetic to the Qing.