Among the emperors Qianlong, Yongzheng, and Taizong of the Qing dynasty, who initiated the era of prosperity notoriously named after him?

Kangxi

Emperor Kangxi is often considered one of the greatest emperors of China. His 61-year reign is the longest in Chinese history before that of Qianlong, his grandson. Kangxi not only consolidated the power of the Qing dynasty over China, but he also promoted science, art, and literature. He is famous for commissioning the compilation of the Kangxi Encyclopedia, one of the most extensive encyclopedias of the pre-modern world. His vision and support for innovations laid the foundations of a stable and prosperous empire, marking a flagship period in Chinese history.