A detailed set of dress regulations, know as the Huangchao liqi tushi (Illustrated Precedents for the Royal Paraphernalia of the Imperial Court) issued in 1759 during the emperor Qianlong's reign, made the wearing of a dark surcoat with rank badges on front and back mandatory for all officials.The emperor's surcoat is called a gunfu (royal robes) and displayed four front-facing, five-clawed dragon in roundels: on the upper chest, back and on each shoulder. The two medallions on the shoulders bear one of the Twelve Imperial emblems: the Sun and the Moon disc.