Daoguang Emperor in the context of "Yishan (official)"

A lunisolar calendar is a calendar in many cultures, that combines monthly lunar cycles with the solar year. As with all calendars which divide the year into months, there is an additional requirement that the year have a whole number of months (Moon cycles). The majority of years have twelve months but every second or third year is an embolismic year, which adds a thirteenth intercalary, embolismic, or leap month.

In contrast to purely lunar calendars such as the Islamic calendar, lunisolar calendars have additional intercalation rules that reset them periodically into a rough agreement with the solar year and thus with the seasons.

Guangzhou is the capital and largest city of southern China's Guangdong province. Located on the Pearl River about 120 km (75 mi) northwest of Hong Kong and 145 km (90 mi) north of Macau, Guangzhou has a history of over 2,200 years and was a major terminus of the Silk Road.

The port of Guangzhou serves as transportation hub. Guangzhou is also one of China's three largest cities. For a long time, it was the only Chinese port accessible to most foreign traders. Guangzhou was captured by the British during the First Opium War and no longer enjoyed a monopoly after the war. Consequently it lost trade to other ports such as Hong Kong and Shanghai, but continued to serve as a major entrepôt. Following the Second Battle of Chuenpi in 1841, the Treaty of Nanking was signed between Sir Robert Peel on behalf of Queen Victoria and Lin Zexu on behalf of Emperor Xuanzong and ceded Hong Kong to the United Kingdom on 26 January 1841 after the agreement of the Convention of Chuenpi.

The Convention of Chuenpi (also "Chuenpee", pinyin: Chuān bí) was a tentative agreement between British Plenipotentiary Charles Elliot and Chinese Imperial Commissioner Qishan during the First Opium War between the United Kingdom and the Qing dynasty of China. The terms were published on 20 January 1841, but both governments rejected them and dismissed Elliot and Qishan, respectively, from their positions. Foreign Secretary Lord Palmerston stated that Elliot acquired too little while the Daoguang Emperor believed Qishan conceded too much. Palmerston appointed Major-General Henry Pottinger to replace Elliot, while the emperor appointed Yang Fang to replace Qishan, along with Yishan as General-in-Chief of Repressing Rebellion and Longwen as an assistant regional commander. Although the convention was unratified, many of the terms were later included in the Treaty of Nanking (1842).

The Xianfeng Emperor (17 July 1831 – 22 August 1861), also known by his temple name Emperor Wenzong of Qing, personal name Yizhu, was the eighth emperor of the Qing dynasty, and the seventh Qing emperor to rule over China proper. During his reign, the Qing dynasty experienced several wars and rebellions including the Taiping Rebellion, the Nian Rebellion, and the Second Opium War. He was the last Chinese emperor to exercise sole power.

The fourth son of the Daoguang Emperor, he assumed the throne in 1850 and inherited an empire in crisis. A few months after his ascension, the Taiping Rebellion broke out in southern China and rapidly spread, culminating in the fall of Nanjing in 1853. Contemporaneously, the Nian Rebellion began in the north, followed by ethnic uprisings (the Miao Rebellion and the Panthay Rebellion) in the south. The revolts ravaged large parts of the country, caused millions of deaths and would not be quelled until well into the reign of the Xianfeng Emperor's successor. Qing defeat during the first phase of the Second Opium War led to the Treaty of Tientsin and the Treaty of Aigun, the latter of which resulted in the cession of much of Manchuria to the Russian Empire. Negotiations broke down and hostilities resumed soon after, and in 1860 Anglo-French forces entered Beijing and burned the Old Summer Palace. The Xianfeng Emperor was forced to flee for the imperial estate at Jehol, and the Convention of Peking was negotiated in his absence.

Zaifeng (12 February 1883 – 3 February 1951), also known as Tsai Feng, Prince of Ch'ün, formally known by his title Prince Chun, was a Manchu prince and regent of the late Qing dynasty. He was a son of Yixuan, the seventh son of the Daoguang Emperor, and the father of Puyi, the Last Emperor. He served as prince regent from 1908 to 1911 during the reign of his son until the Qing dynasty was overthrown by the Xinhai Revolution in 1911.

Lin Zexu (30 August 1785 – 22 November 1850), courtesy name Yuanfu, was a Chinese political philosopher and politician. He was a head of state (Viceroy), Governor General, scholar-official, and under the Daoguang Emperor of the Qing dynasty best known for his role in the First Opium War of 1839–42. He was from Fuzhou, Fujian Province. Lin's forceful opposition to the opium trade was a primary catalyst for the First Opium War. He is praised for his constant position on the "moral high ground" in his fight, but he is also blamed for a rigid approach which failed to account for the domestic and international complexities of the problem. The Emperor endorsed the hardline policies and anti-drugs movement advocated by Lin, but placed all responsibility for the resulting disastrous Opium War onto Lin. However, Lin's efforts against the opium trade was appreciated by drug prohibition activists and revered as a culture hero in Chinese culture, symbolizes drug abuse resistance in China.