May 4th. According to historical data, Qianlong, formerly known as Aisin Gioro Hung Li, was the fourth son of yongzheng emperor, and his biological mother was Niuzhilu, the empress of filial piety. Emperor Qianlong was the sixth emperor of the Qing Dynasty and the fourth emperor after Beijing. After 60 years in office, he continued to lecture on politics and actually exercised the supreme power for 63 years and four months. He is the longest and longest-lived emperor in the history of China.