The Qianlong Emperor (25 September 1711 - 7 February 1799) was the sixth emperor of the Manchu-led Qing dynasty, and the fourth Qing emperor to rule over China proper. Born Aisin-Gioro Hongli, the fourth son of the Yongzheng Emperor, he reigned officially from 11 October 1735 to 8 February 1796. On 8 February, he abdicated in favour of his son, the Jiaqing Emperor - a filial act in order not to reign longer than his grandfather, the illustrious Kangxi Emperor. Despite his retirement, however, he retained ultimate power as the Emperor Emeritus (or Retired Emperor) until his death in 1799; he thus was one of the longest-reigning de factorulers in the history of the world, and dying at the age of 87, one of the longest-living. As a capable and cultured ruler inheriting a thriving empire, during his long reign the Qing Empire reached its most splendid and prosperous era, boasting a large population and economy. As a military leader, he led military campaigns expanding the dynastic territory to the largest extent by conquering and sometimes destroying Central Asian kingdoms. This turned around in his late years: the Qing empire began to decline with corruption and wastefulness in his court and a stagnating civil society. 

A British valet who accompanied his diplomat master to the Qing court in 1793 described the emperor: 

Cash was a type of coin of China and East Asia, used from the 4th century BC until the 20th century AD. Originally cast during the Warring States period, these coins continued to be used for the entirety of Imperial China as well as under Mongol, and Manchu rule. The last Chinese cash coins were cast in the first year of the Republic of China. Generally most cash coins were made from copper or bronze alloys, with iron, lead, and zinc coins occasionally used less often throughout Chinese history. Rare silver and gold cash coins were also produced. During most of their production, cash coins were cast but, during the late Qing dynasty, machine-struck cash coins began to be made. As the cash coins produced over Chinese history were similar, thousand year old cash coins produced during the Northern Song dynasty continued to circulate as valid currency well into the early twentieth century. 

In the modern era, these coins are considered to be Chinese "good luck coins"; they are hung on strings and round the necks of children, or over the beds of sick people. They hold a place in various superstitions, as well as Traditional Chinese medicine, and Feng shui. Currencies based on the Chinese cash coins include the Japanese mon, Korean mun, Ryukyuan mon, and Vietnamese văn.