The Greatest King of Joseon "King Sejong" King Sejong, also known as Sejong the Great, was the fourth king of the Joseon Dynasty, which ruled Korea from 1392 to 1910. He reigned from 1418 to 1450 and is widely regarded as one of the most important figures in Korean history. King Sejong is best known for his contributions to the development of the Korean alphabet, which is known as Hangeul. At th..
