Who wrote the Han Xu Xiu on the plaque of Qianmen archway in the Summer Palace?

Gan Long, which means the scenery is quiet and beautiful, contains an empty realm, just like a beautiful picture. These four words fully reflect the emperor Qianlong's high praise and love for the scenery of the Summer Palace. Emperor Qianlong was a famous emperor in Qing Dynasty. During his reign, he carried out large-scale cultural construction and artistic creation, including many calligraphy works.