History of Chengde
In 1703, Chengde was chosen by the Kangxi Emperor as the location for his summer residence. Constructed throughout the eighteenth century, the Mountain Resort was used by both the Yongzheng and Qianlong emperors. The site is currently an UNESCO World Heritage Site. Since the seat of government followed the emperor, Chengde was a political center of the Chinese empire during these times.
The city of Jehol—an early romanization of Rehe via the French transcription of the northern suffix ér as eul—reached its height under the Qianlong Emperor 1735-1796 (died 1799). The great Putuo Zongcheng Temple, loosely based on the Potala in Lhasa, was completed after just four years of work in 1771. It was heavily decorated with gold and the emperor worshipped in the Golden Pavilion. In the temple itself was a bronze-gilt statue of Tsongkhapa, the Reformer of the Gelugpa sect.
Under the Republic of China, Chengde was the capital of Rehe province. From 1933 to 1945 the city was under Japanese control as a part of the Manchurian puppet state known as Manchukuo. After World War II the Kuomintang regained jurisdiction. In 1948, the People’s Liberation Army took control of Chengde. It would remain a part of Rehe until 1955, when the province was abolished, and the city was incorporated into Hebei.
The city is home to large populations of ethnic minorities, Mongol and Manchu in particular.
Source From: https://en.wikipedia.org/wiki/Chengde#History