
Government of Joseon · Public domain · Source
Sejong the Great
Fourth king of Joseon, creator of Hangul, patron of science and of the northern frontier
Taejong's third son. He expanded the Jiphyeonjeon to train scholars and, through the Uijeongbu seosa system, shared state business with the chief ministers. He created Hunminjeongeum in 1443 and promulgated it in 1446, and had the Yongbi eocheonga and Worin cheongang jigok composed. He published the Nongsa jikseol, the Chiljeongsan calendar, the Hyangyak jipseongbang and the Samgang haengsildo, had Jang Yeong-sil and others build the Jagyeongnu water clock and the Angbu ilgu sundial and cast the Gabin type, and set up rain gauges in the capital and the counties. He fixed the gongbeop land tax with six grades of land and nine grades of harvest. Abroad he attacked Tsushima, concluded the Gyehae Treaty and opened the Four Commanderies and Six Garrisons. He had Bak Yeon reorganise court music (aak).



