The Yongyousi Pagoda was built by the Qianlong Emperor (the sixth emperor of the Manchu-led Qing Dynasty) in honour of his mother. 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 a UNESCO World Heritage Site. Since the seat of government followed the emperor, Chengde was a political center of the Chinese empire during these times. Chengde, formerly known as Jehol, reached its height under the Qianlong Emperor 1735-1796 (died 1799). The great monastery temple of the Potala, loosely based on the famous 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.