Heungseon Daewongun in the context of "Gwangmu Emperor"

The Japan–Korea Treaty of 1876 (also known as the Japan–Korea Treaty of Amity in Japan and the Treaty of Ganghwa Island in Korea) was made between representatives of the Empire of Japan and the Kingdom of Joseon in 1876. Negotiations were concluded on February 26, 1876.

In Korea, Heungseon Daewongun, who instituted a policy of increased isolationism against the European powers, was forced into retirement by his son King Gojong and Gojong's wife, Empress Myeongseong. France and the United States had already made several unsuccessful attempts to begin commerce with the Joseon dynasty during the Daewongun's era. However, after Daewongun was removed from power, many new officials took power who supported the idea of opening commerce with foreigners.

Around 6 a.m. on 8 October 1895, Queen Min, the consort of the Korean monarch Gojong, was assassinated by a group of Japanese agents under Miura Gorō. After her death, she was posthumously given the title of "Empress Myeongseong". The attack happened at the royal palace Gyeongbokgung in Seoul, Joseon. This incident is known in Korea as the Eulmi Incident.

By the time of her death, the queen had acquired arguably more political power than even her husband. Through this process, she made many enemies and escaped a number of assassination attempts. Among her opponents were the king's father the Heungseon Daewongun, the pro-Japanese ministers of the court, and the Korean army regiment that had been trained by Japan: the Hullyŏndae. Weeks before her death, Japan replaced their emissary to Korea with a new one: Miura Gorō. Miura was a former military man who professed to being inexperienced in diplomacy, and reportedly found dealing with the powerful queen frustrating. After the queen began to align Korea with the Russian Empire to offset Japanese influence, Miura struck a deal with Adachi Kenzō of the newspaper Kanjō shinpō and possibly also the Daewongun to carry out her killing.

Gojong (Korean: 고종; Hanja: 高宗; 8 September 1852 – 21 January 1919), personal name Yi Myeongbok (이명복; 李命福), later Yi Hui (이희; 李㷩), also known as the Gwangmu Emperor (광무제; 光武帝), was the penultimate Korean monarch. He ruled Korea for 43 years, from 1864 to 1907, first as the last king of Joseon, and then as the first emperor of the Korean Empire from 1897 until his forced abdication in 1907. His wife, Queen Min (posthumously honored as Empress Myeongseong), played an active role in politics until her assassination carried out by the Japanese.

Gojong oversaw the bulk of the Korean monarchy's final years. He was born into the ruling House of Yi, and was first crowned on 13 December 1863 at the age of twelve. His biological father, Grand Internal Prince Heungseon (widely known as Heungseon Daewongun), acted as regent until he reached the age of majority, although he continued holding power until 1874. At this time, Korea was under policies of strict isolationism. By contrast, Japan had been rapidly modernizing under the Meiji Restoration. In 1876, Japan forcefully opened Korea and began a decades-long process of moving the peninsula into its own sphere of influence. For the following few decades, Korea was highly unstable, and subjected to a number of foreign encroachments. Incidents such as the 1882 Imo Incident, the 1884 Kapsin Coup, the 1894–1895 Donghak Peasant Rebellion, and the 1895 assassination of Gojong's wife occurred during his reign. All of these incidents were related to or involved foreign powers.

The Japanese occupation of Gyeongbokgung Palace (Korean: 일본군의 경복궁 점령) or the Gabo Incident occurred on 23 July 1894, during the ceasefire of the Donghak Peasant Revolution and the beginning of the First Sino-Japanese War. Imperial Japanese forces led by Japanese Minister Plenipotentiary to Korea Ōtori Keisuke and Ōshima Yoshimasa occupied Gyeongbokgung palace to restore King Gojong's father Heungseon Daewongun and establish a pro-Japanese government under Kim Hong-jip and the Enlightenment Party's administration.

Empress Myeongseong (Korean: 명성황후; Hanja: 明成皇后; 17 November 1851 – 8 October 1895) was the official wife of Gojong, the 26th king of Joseon and the first emperor of the Korean Empire. During her lifetime, she was known by the name Queen Min (민비; 閔妃). After the founding of the Korean Empire, she was posthumously given the title of Myeongseong, the Great Empress (명성태황후; 明成太皇后).

The later Empress was of aristocratic background and in 1866 was chosen by the de facto Regent Heungseon Daewongun to marry his son, the future King Gojong. Seven years later his daughter-in-law and her Min clan forced him out of office. Daewongun was a conservative Confucian later implicated in unsuccessful rebellion against his daughter-in-law's faction. He believed in isolation of Joseon from all foreign contact as a means of preserving independence. She, by contrast, was a believer in gradual modernisation using Western and Chinese help. From 1873 to her assassination in 1895 she oversaw economic, military and governmental modernisation.