Korean History › Opening & Korean Empire › Treaty of Ganghwa (Japan–Korea Treaty of 1876)
Gapsin Coup
December 4–6, 1884· Event· Rulers & states
Well documentedSolid records, physical evidence or scientific consensus.
A three-day coup in December 1884 by young pro-Japan reformers who tried to seize power and modernize Joseon.
See it on the Korean History map →What happened
Kim Ok-gyun, Pak Yeong-hyo, Seo Jae-pil and other young "Enlightenment Party" officials admired Meiji Japan and resented Chinese control. On December 4, 1884, at a banquet opening Seoul's new post office, they launched the Gapsin Coup (갑신정변): killed conservative ministers, took charge of the king and issued a 14-point program to end tribute to China, abolish class privilege and reform taxes. Backed by only about 150 Japanese legation guards, they were crushed within three days by some 1,500 Qing troops under Yuan Shikai.
Why it matters
Its failure tightened Chinese control for a decade, and the Tianjin Convention it led to (1885) set the rules that brought both armies back in 1894.
How we know
Kim Ok-gyun's own account, Gapsin illok, which preserves the program, plus Korean, Japanese and Chinese diplomatic records.
Still debated
How much Japan's minister Takezoe Shin'ichirō promised and then abandoned the plotters is debated, as is whether the coup had any popular support.
Connections (3)
▸Silhak (Practical Learning) foreshadowed the reformers of Gapsin CoupMostly agreed
The connection
Bak Gyu-su, grandson of the Northern Learning scholar Bak Ji-won, gathered young aristocrats such as Kim Ok-gyun and Pak Yeong-hyo in the 1870s and taught them his grandfather's writings along with new ideas from China. They became the Enlightenment Party behind the 1884 coup.
When and how
Bak Gyu-su's home in Seoul's Bukchon, 1870s; interpreter O Gyeong-seok and physician Yu Hong-gi also shaped the group.
How sure are we?
Members' later recollections, including Pak Yeong-hyo's, describe Bak Gyu-su's teaching.
Debates and open questions
How direct the line from Silhak to the enlightenment movement was is debated; Meiji Japan influenced the plotters more directly.
▸Imo Incident brought Qing troops who later crushed Gapsin CoupWell documented
The connection
The Qing troops sent in 1882 stayed in Seoul, and China tightened control, with Yuan Shikai acting almost as a resident governor. The reformers struck in 1884 after half those troops left to fight France; the remaining garrison, led by Yuan, retook the palace within three days.
When and how
Seoul, 1882–1884; about 1,500 Qing troops remained in late 1884, under Wu Zhaoyou and Yuan Shikai.
How we know
Chinese, Japanese and Korean records of the fighting at Changdeokgung on December 6, 1884.
Debates and open questions
Whether the plotters underestimated the remaining Qing strength or trusted Japanese promises of support is debated.
▸Gapsin Coup anticipated reforms of Gabo ReformMostly agreed
The connection
The 1884 plotters' 14-point program, ending tribute to China, equal rights, abolishing privilege, reforming taxes and appointing by ability, was largely enacted a decade later in the Gabo Reform. Coup veterans Pak Yeong-hyo and Seo Gwang-beom returned from exile to serve as Gabo ministers.
When and how
Seoul: the 1884 program; the 1894–95 Gabo cabinets, with Pak Yeong-hyo as home minister.
How sure are we?
The 14 points survive in Kim Ok-gyun's Gapsin illok; Gabo decrees cover many of the same items.
Debates and open questions
The program is known mainly from Kim's own memoir, so its exact wording, and whether hindsight shaped it, is uncertain.