Sejong the Great (May 15; 1397 - April 8; 1450; r. 1418-1450) was the fourth king of Joseon. He was the third son between King Taejong and Queen-Consort Min. He was designated as heir-apparent; Grand Prince; after his older brother Jae was stripped of his title. He ascended to the throne in 1418.

Sejong reinforced Confucian policies and instituted major legal amendments (??; ??). He also oversaw the creation of Hangul script; encouraged advancements of scientific technology; and instituted many other efforts to stabilize and improve prosperity. He dispatched military campaigns to the north and installed Samin Policy (????; ????) to attract new settlers to the region. To the south; he subjugated Japanese raiders and captured Tsushima Island.

During his reign from 1418 to 1450; he governed from 1418 to 1442 and governed as regent with his son Grand Prince MoonJong until his death in either 1442 or 1450 Pictures From History