The Xingyouhengtang ('Hall of Constancy') seal mark identifies the censer as having belonged to the Fifth Prince Ding, Zaiquan of the Qing dynasty. Xingyouhengtang was the prince's main residence in the Forbidden City. Zaiquan was the great-great-grandson of the Qianlong Emperor and had a distinguished career in the service of the court until his death in 1854. The prince was a keen art collector and appears to have made it a habit to have his hall mark inscribed on his artifacts. His collector's seal with the same six-character inscription appears on a Yuan dynasty painting by Qian Xuan titled Laiqin zhizi tu (Crabapple and Gardenia), now in the collection of the Freer Gallery of Art, Smithsonian Institution. For his biography see Arthur W. Hummel, Eminent Chinese of the Ch’ing Period, Taipei, 1991, pp. 728–729.