Royal Tomb of King Sejong

Sejong the Great was the fourth king of the Joseon dynasty of Korea. He was the third son of King Taejong and Queen Wongyeong. Sejong was designated as Crown Prince after his older brother Prince Yangnyeong was stripped of his title. He ascended to the throne in 1418. During the first four years of Sejong's reign, Taejong governed as regent and executed Sejong's father-in-law, Sim On, and his close associates.

Sejong reinforced Korean Confucian and Neo-Confucian policies, and enacted major legal amendments. He personally created and promulgated the Korean alphabet Hangul, encouraged advancements of science and technology, and introduced measures to stimulate economic growth. He dispatched military campaigns to the north and instituted the Samin policy to attract new settlers to the region. To the south, he helped subjugate Japanese pirates, and in the Ōei Invasion capture Tsushima Island.