The first election was in Qianlong years and the second was in middle and later periods of Qing Dynasty, namely years from Tongzhi Emperor to Guangxu Emperor.
He was the last of the Western painters who worked for Qianlong, together with Father Louis Antoine de Poirot (1735-).
The location of the house was once the garden of the scholar Heshen（和珅）in the reign of Emperor Qianlong(乾隆) in the Qing Dynasty.
The later Qianlong Emperor dispatched an army to Yili in order to suppress their resistance against the Qing Dynasty.
The Emperor Qianlong (Ch'ien-lung) (reigned 1735–99) sent Helin, brother to the infamously corrupt eunuch Heshen and Fukangan, related by marriage to the Emperor, to quell the uprising.
Bak's cousin had been dispatched to the Qing court by the Joseon king Jeongjo to attend the 70th birthday celebrations of the Qing emperor Qianlong.