Emperor Kang Shi's (Kangxi) tour of Kiang-Han in 1699, by Qing Dynasty Chinese School. The Kangxi Emperor (1654-1722) was the 4th emperor of the Qing Dynasty. His reign of 61 years makes him the longest-reigning Chinese emperor in history and one of the longest-reigning rulers in the world. Kangxi is considered one of China's greatest emperors. He suppressed the Revolt of the Three Feudatories, forced the Kingdom of Tungning in Taiwan to submit to Qing rule, blocked Tzarist Russia on the Amur River and expanded the empire in the northwest. Kangxi's reign brought about long-term stability and relative wealth after years of war and chaos. He initiated the period known as the "Prosperous Era of Kangxi and Qianlong", which lasted for generations after his own lifetime. By the end of his reign, the Qing Empire controlled all of China proper, Taiwan, Manchuria, part of the Russian Far East (Outer Manchuria), both Inner and Outer Mongolia, Tibet proper, and Joseon Korea as a protectorate. He died in 1722 at the age of 68.