Daoguang EmperorThe Daoguang Emperor (; 16 September 1782 – 26 February 1850), also known by his temple name Emperor Xuanzong of Qing, personal name Mianning, was the seventh emperor of the Qing dynasty, and the sixth Qing emperor to rule over China proper, reigning from 1820 to 1850. His reign was marked by "external disaster and internal rebellion." These included the First Opium War and the beginning of the Taiping Rebellion which nearly brought down the dynasty.
HaijinThe Haijin (海禁) or sea ban was a series of related isolationist policies in China restricting private maritime trading and coastal settlement during most of the Ming dynasty and early Qing dynasty. Despite official proclamations the Ming policy was not enforced in practice, and trade continued without hindrance. The early Qing dynasty's anti-insurgent "Great Clearance" was more definitive with devastating effects on communities along the coast.
First Opium WarThe First Opium War (), also known as the Opium War or the Anglo-Sino War was a series of military engagements fought between the British Empire and the Qing dynasty of China between 1839 and 1842. The immediate issue was the Chinese enforcement of their ban on the opium trade by seizing private opium stocks from merchants at Canton and threatening to impose the death penalty for future offenders. Despite the opium ban, the British government supported the merchants' demand for compensation for seized goods, and insisted on the principles of free trade and equal diplomatic recognition with China.
OpiumOpium (or poppy tears, scientific name: Lachryma papaveris) is dried latex obtained from the seed capsules of the opium poppy Papaver somniferum. Approximately 12 percent of opium is made up of the analgesic alkaloid morphine, which is processed chemically to produce heroin and other synthetic opioids for medicinal use and for the illegal drug trade. The latex also contains the closely related opiates codeine and thebaine, and non-analgesic alkaloids such as papaverine and noscapine.