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Sejong was born in Hanyang ([[Seoul]]), on 1397/4/10. He was the third son of a royal prince and princess who later took the throne as [[King Taejong]] and Queen Wongyeong. He ascended to the throne himself at age 22, in 1418.

Sejong was born in Hanyang ([[Seoul]]), on 1397/4/10. He was the third son of a royal prince and princess who later took the throne as [[King Taejong]] and Queen Wongyeong. He ascended to the throne himself at age 22, in 1418.

His reign saw the standardization and codification of much court ritual; he had Confucian scholars at court consult ancient Chinese texts and compile an authoritative Joseon ritual code.

His reign saw the standardization and codification of much court ritual, including court music; he had Confucian scholars at court consult ancient Chinese texts and compile an authoritative Joseon ritual code.

''Hangul'' is traditionally considered to have been introduced in [[1443]]. Sejong oversaw the publication of ''[[Hunminjeongeum]]'', a book explaining the new writing system, in [[1446]].

''Hangul'' is traditionally considered to have been introduced in [[1443]]. Sejong oversaw the publication of ''[[Hunminjeongeum]]'', a book explaining the new writing system, in [[1446]].