Who is the longest ruling emperor of China?
Kangxi Emperor
The Revolt of the Three Feudatories broke out in 1673 when Wu Sangui's forces overran most of southwest China and he tried to ally himself with local generals such as Wang Fuchen. The Kangxi Emperor employed generals including Zhou Peigong and Tuhai to suppress the rebellion, and also granted clemency to common people caught up in the war. He intended to personally lead the armies to crush the rebels but his subjects advised him against it. The Kangxi Emperor used mainly Han Chinese Green Standard Army soldiers to crush the rebels while the Manchu Banners took a backseat. The revolt ended with victory for Qing forces in 1681.