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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, and also directed efforts to combine ''aak'' (ceremonial music; J: ''[[gagaku]]''), ''dangak'' (Chinese music), and ''hyangak'' (native Korean music) to establish new standard forms for ritual/court music.

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, and also directed efforts to combine ''aak'' (ceremonial music; J: ''[[gagaku]]''), ''dangak'' (Chinese music), and ''hyangak'' (native Korean music) to establish new standard forms for ritual/court music.

''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]]. Around the same time, he also oversaw the production of the first novel in ''hangull'', ''[[Yongbi Eocheonga]]'' (Songs of Flying Dragons); as well as a book on celestial calculations; and oversaw the improvement of the kingdom's weaponry, including especially various forms of cannon, firearms, and artillery.

Sejong's queen was Queen Soheon. He was succeeded by one of his sons, who took the throne as [[King Munjong]]. Sejong had 13 other sons, and four daughters.

Sejong's queen was Queen Soheon. He was succeeded by one of his sons, who took the throne as [[King Munjong]]. Sejong had 13 other sons, and four daughters.