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Eulsa Treaty (Japan–Korea Protectorate Treaty)
November 17, 1905 (validity disputed)· Event· Rulers & states
Well documentedSolid records, physical evidence or scientific consensus.
A November 1905 treaty, signed under Japanese military pressure, that made Korea a Japanese protectorate and handed its foreign affairs to Japan.
See it on the Korean History map →What happened
After beating Russia, Japan sent Ito Hirobumi to Seoul. On November 17, 1905, with Japanese troops posted around the palace, five of eight cabinet ministers agreed and Foreign Minister Pak Je-sun signed; Emperor Gojong refused to sign or seal it. The treaty, called Eulsa Neugyak (을사늑약, 'forced treaty') in Korea, gave Japan control of Korea's diplomacy and installed a Japanese Resident-General in Seoul. The ministers who agreed, including Yi Wan-yong, are remembered as the 'Five Eulsa Traitors'.
Why it matters
It ended Korean independence in all but name and set up annexation five years later; its legality is still a live issue between Seoul and Tokyo.
Think of it like
Like a forced receivership: an outsider takes over the building's contracts and outside dealings while the owner still holds title on paper.
How we know
The treaty text, Japanese and Korean official records, Ito's reports, foreign diplomats' dispatches, and the Hwangseong Sinmun editorial 'Today We Cry Out in Lament' of November 20, 1905.
Still debated
Whether it was ever legally valid: Korea holds it void because of coercion and the missing imperial seal; Japan's government long held it was lawfully concluded.
Inside this (2)
Connections (7)
▸Russo-Japanese War led to Eulsa Treaty (Japan–Korea Protectorate Treaty)Well documented
The connection
Victory over Russia removed Japan's last rival in Korea. The September 1905 Treaty of Portsmouth recognized Japan's 'paramount' interests there, and the US (Taft–Katsura memorandum, July 1905) and Britain (renewed alliance, August 1905) accepted Japanese control. Ten weeks after Portsmouth, Japan imposed the protectorate.
When and how
War in Manchuria and Korean waters, 1904–1905; peace signed at Portsmouth, New Hampshire, September 5, 1905; protectorate imposed in Seoul, November 17, 1905.
How we know
The Portsmouth treaty text, the Taft–Katsura memorandum, the 1905 Anglo-Japanese Alliance, and Japanese cabinet decisions planning a protectorate.
Debates and open questions
Whether the Taft–Katsura talk was a deliberate US trade-off, Korea for the Philippines, or just an informal exchange of views is still debated.
▸Eulsa Treaty (Japan–Korea Protectorate Treaty) stripped the diplomatic rights of Korean EmpireWell documented
The connection
The treaty put all of the Korean Empire's foreign relations under Japan's Foreign Ministry and installed a Resident-General in Seoul. Foreign legations left and Korea's own legations abroad closed. Gojong stayed emperor, but Japan increasingly controlled finance, police and appointments through its 'advisers'.
When and how
Gyeongun-gung (now Deoksugung) Palace, Seoul, November 17–18, 1905; the Residency-General opened in February 1906 with Ito Hirobumi in charge.
How we know
The treaty's five articles, Residency-General records, and foreign governments' withdrawal of their ministers from Seoul, the US first, in late 1905.
Debates and open questions
Korea argues the empire never lawfully consented, since Gojong refused to sign and ministers were coerced; Japan argued the foreign minister's signature sufficed.
▸Hague Secret Emissary Affair protested Eulsa Treaty (Japan–Korea Protectorate Treaty)Well documented
The connection
Gojong held that the 1905 treaty was void because he had never approved it, and sent envoys to the 1907 peace conference to tell the world. They were barred precisely because, under that treaty, Japan now spoke for Korea abroad.
When and how
The Hague, Netherlands, June 25 – July 1907; envoys Yi Sang-seol, Yi Jun and Yi Wi-jong, helped by American missionary Homer Hulbert.
How we know
Their petition to conference delegates, Gojong's letter of credentials, press coverage including Yi Wi-jong's 'A Plea for Korea', and Japanese diplomatic cables.
Debates and open questions
Gojong at first denied sending them; historians accept that he did, but who planned the mission and what he expected it to achieve remain debated.
▸An Jung-geun shot Ito Hirobumi, architect of the Eulsa Treaty (Japan–Korea Protectorate Treaty)Well documented
The connection
Ito forced the 1905 treaty through and served as the first Resident-General until mid-1909. Under interrogation An listed fifteen charges against Ito, including the coerced protectorate treaty and Empress Myeongseong's murder. He said he acted as a lieutenant general of a Korean righteous army, not as a private assassin.
When and how
Harbin railway station, Manchuria, about 9:30 a.m., October 26, 1909, as Ito arrived to meet Russian finance minister Vladimir Kokovtsov.
How we know
An's own statements in Japanese interrogation and trial records, eyewitness reports, and Russian railway police files.
Debates and open questions
Ito had favored slower, indirect control; some historians argue his death removed a voice for caution, others that annexation was already decided.
▸Eulsa Treaty (Japan–Korea Protectorate Treaty) led to Japanese colonial rule of KoreaWell documented
The connection
The protectorate was a staircase to annexation. After 1905 Japan held Korea's diplomacy; the 1907 treaty added internal administration and ended the army; a 1909 memorandum handed over courts and prisons, and a 1910 one the police. The August 1910 annexation treaty, signed by Prime Minister Yi Wan-yong, completed the takeover.
When and how
Seoul, 1905–1910, under Residents-General Ito Hirobumi, Sone Arasuke and Terauchi Masatake, who signed the annexation treaty on August 22, 1910.
How we know
The successive treaty texts of 1905, 1907, 1909 and 1910, Japanese cabinet decisions, and Residency-General records.
Debates and open questions
Whether annexation was planned from 1905 or came only after debate within Japan's leadership, where Ito preferred indirect rule, is argued.
▸Treaty of Ganghwa (Japan–Korea Treaty of 1876) began the path to Eulsa Treaty (Japan–Korea Protectorate Treaty)Mostly agreed
The connection
The 1876 treaty, forced by Japanese gunboats, declared Korea 'independent', a step to pry it from China's orbit, and gave Japan open ports, coastal surveys and extraterritorial rights. Over three decades Japan built on that foothold, and on wars with China and Russia, until it could impose the 1905 protectorate.
When and how
Ganghwa Island, February 1876, after the 1875 Unyo incident; then Seoul and the treaty ports of Busan, Wonsan and Incheon through 1905.
How sure are we?
The 1876 treaty text and Japanese diplomatic records showing step-by-step expansion of rights, from ports and consular courts to the 1904 protocols.
Debates and open questions
Historians debate whether a protectorate was a long-term aim in 1876 or became possible only after Japan's victories in 1895 and 1905.
▸Eulsa Treaty (Japan–Korea Protectorate Treaty) provoked a new wave of Righteous armies against Japan (1895–1915)Well documented
The connection
The 1905 protectorate treaty, which put Korea's foreign affairs under Japan, set off a second rising. Former officials Min Jong-sik and Choe Ik-hyeon led forces in 1906, and commoner Sin Dol-seok led a large band in the east. After Japan disbanded Korea's army in 1907, the movement grew into a near-national war.
When and how
Chungcheong, Jeolla, Gyeongsang and Gangwon, 1905–1907; Min Jong-sik captured Hongju fortress in May 1906.
How we know
Leaders' proclamations denounce the treaty; Japanese military records track the spreading fighting.
Debates and open questions
The treaty's legality is disputed because Gojong never signed it; scholars also debate tensions between yangban and commoner commanders.