Heungseon Daewongun (, 1820 - 1898; lit. 'Grand Internal Prince Heungseon') was the title of Yi Ha-eung, the regent of Joseon during the minority of Emperor Gojong in the 1860s. Until his death, Yi Ha-Eung was a key political figure of late Joseon Korea. He had to solve the difficult problems of a new world historical trend and reconstruction of the impoverished nation at once. Daewongun literally translates as "prince of the great court", a title customarily granted to the father of the reigning monarch when that father did not reign himself (usually because his son had been adopted as heir of a relative who did reign). The Daewongun is remembered for the wide-ranging reforms he attempted during his regency, as well as for his "vigorous enforcement of the seclusion policy, persecution of Christians, and the killing or driving off of foreigners who landed on Korean soil" : the "closed door" policy.