Guan Tianpei, courtesy name Zhongyin (仲因), art name Zipu (滋圃), was a Chinese admiral of the Qing dynasty who served in the First Opium War. His Chinese title was "Commander-in-Chief of Naval Forces". In 1838, he established courteous relations with British Rear-Admiral Frederick Maitland. Guan fought in the First Battle of Chuenpi (1839), the Second Battle of Chuenpi (1841), and the Battle of the Bogue (1841). The British account described his death in the Anunghoy forts during the Battle of the Bogue on 26 February 1841 as follows: Among these [Chinese officers], the most distinguished and lamented was poor old Admiral Kwan, whose death excited much sympathy throughout the force; he fell by a bayonet wound in his breast, as he was meeting his enemy at the gate of Anunghoy, yielding up his brave spirit willingly to a soldier's death, when his life could only be preserved with the certainty of degradation. He was altogether a fine specimen of a gallant soldier, unwilling to yield when summoned to surrender because to yield would imply treason.

The First Opium War, also known as the Anglo-Chinese 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 Guangzhou 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. Opium was Britain's single most profitable commodity trade of the 19th century. After months of tensions between the two states, the Royal Navy launched an expedition in June 1840, which ultimately defeated the Chinese using technologically superior ships and weapons by August 1842. The British then imposed the Treaty of Nanking, which forced China to increase foreign trade, give compensation, and cede Hong Kong Island to the British. Consequently, the opium trade continued in China. Twentieth-century nationalists considered 1839 the start of a century of humiliation, and many historians consider it the beginning of modern Chinese history.