Posthumous name
King Sejong Jangheon Yeongmun Yemu Inseong Myeonghyo the Great 세종장헌영문예무인성명효대왕 世宗莊憲英文睿武仁聖明孝大王
Temple name
Sejong

House

Jeonju Yi

Father

Taejong of Joseon

Mother

Queen Wongyeong

Religion

Confucianism; later, Buddhism

Posthumous name
King Sejong Jangheon Yeongmun Yemu Inseong Myeonghyo the Great 세종장헌영문예무인성명효대왕 世宗莊憲英文睿武仁聖明孝大王
Temple name
Sejong

Birth name
Korean name
"Sejong" in Chinese characters
Hangul
Hanja
Revised Romanization	Sejong Daewang
McCune–Reischauer	Sejong Taewang
Hangul
Hanja
Revised Romanization	I Do
McCune–Reischauer	I To
Childhood name
Hangul
Hanja
Revised Romanization	Won Jeong
McCune–Reischauer	Wŏn Chŏng

Sejong the Great (Korean pronunciation: [se.dʑoŋ]; 15 May 1397 - 8 April 1450) was the fourth king of Joseon-dynasty Korea. He was the third son of King Taejong and Queen consort Min. He was designated as heir-apparent, Crown Prince, after his older brother Jae was stripped of his title. He ascended to the throne in 1418. During the first four years of his reign, Taejong governed as regent, after which his father-in-law, Sim On, and his close associates were executed.

Sejong reinforced Confucian policies and executed major "legal amendments" (공법; 貢法). He also created the Korean alphabet Hangul, encouraged advancements of scientific technology, and instituted many other efforts to stabilize and improve prosperity. He dispatched military campaigns to the north and instituted the Samin Policy (사민정책; 徙民政策) 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 1422 to 1442 and governed as regent with his son Crown Prince Munjong until his death in either 1442 or 1450.

Although the appellation "the Great" / "(대왕;大王)" was given posthumously to almost every ruler of Goryeo and Joseon, this title is usually associated with Gwanggaeto and Sejong.

Sejong was born on May 15, 1397, the third son of King Taejong. When he was twelve, he became Grand Prince Chungnyeong (충녕대군). As a young prince, Sejong excelled in various studies and was favored by King Taejong over his two older brothers.

As the third son of Taejong, Sejong's ascension to the throne was unique. Taejong's eldest son, Yangnyeong (양녕대군), was named heir apparent in 1404. However, Yangnyeong's free spirited nature as well as his preference for hunting and leisure activities resulted in his removal from the position of heir apparent in June 1418. Though it is said that Yangnyeong abdicated in favor of his younger brother, there are no definitive records regarding Yangnyeong's removal. Taejong's second son Grand Prince Hyoryeong became a monk upon the elevation of his younger brother Sejong.

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Wikipedia