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	Lee To
Childhood name
Hangul
Hanja
Revised Romanization	Won Jeong
McCune–Reischauer	Wŏn Chŏng

Sejong the Great (Korean pronunciation: [sʰe(ː)dʑoŋ]; 15 May 1397 - 8 April 1450) was the fourth king of Joseon-dynasty Korea. Born with family name Yi (pronounced [i(ː)]; Hangul: 이; Hanja: 李), given name Do (도; 祹), family origin Jeonju ([tɕʌndʑu]; 전주; 全州), sobriquet Wonjeong (원정; 元正). 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.

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Wikipedia