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The Kangxi Emperor (Chinese: 康熙帝; Kāng xī dì; Mongolian: Enkh Amgalan Khaan, May 4, 1654 – December 20, 1722,68 years old when he died) was the third Emperor of the Manchu-led Qing Dynasty and the second Qing emperor to rule over China proper, from 1661 to 1722. His reign of 61 years makes him the longest-reigning Chinese Emperor in history and one of the longest in the world.
However, having ascended the throne when aged seven, he did not exercise much, if any, control over the empire until later, that role being fulfilled by his four guardians and his grandmother, the Grand Empress Dowager Xiaozhuang. Kangxi, considered one of China's greatest Emperors, was a pivotal figure in Chinese history, having defeated the Three Feudatories, the Zheng Jing government at Taiwan who previously would not submit to Qing rule and the Tzarist Russia, expanded the Qing empire in the northwest, and achieved such literary feats as the Kangxi Dictionary. Kangxi's reign brought about long-term stability and relative wealth after years of war and chaos.
Emperor Kangxi was the architect of the period known as the "Prosperous Era of Kangxi and Qianlong" which lasted generations past his own life. During his reign, the Qing Empire controlled all territory of China proper, Manchuria, parts of the Russian Maritime province and Mongolia and Korea as its protectorate.

[information extracted from Wikipedia.]