May 6, 1397 CE
Birth of Yi Do (Sejong)
Sejong was born as the third son of King Taejong and Queen Wongyeong. His birth name was Yi Do, and he would later become the fourth king of Joseon. #Joseon #KoreanHistory #Sejong
Chronological Storyline (38 Milestones)
1408 CE
Appointed Grand Prince Chungnyeong
Sejong was given the title Grand Prince Chungnyeong. He was known for his scholarly aptitude and was favored by his father over his older brothers. #Joseon #Royalty
Aug 10, 1418 CE
Accession to the Throne
Sejong became the fourth king of Joseon after his older brother, Crown Prince Yangnyeong, was stripped of his title due to misconduct. His father Taejong abdicated in his favor. #Joseon #Accession
1418 CE
Establishment of the Hall of Worthies (Jiphyeonjeon)
Sejong established the Hall of Worthies, a royal research institute that gathered top scholars to conduct research and advise on policy. It played a key role in cultural and scientific advancements. #Joseon #Scholarship
By 문화재청, KOGL Type 1, https://commons.wikimedia.org/w/index.php?curid=107937744
1420 CE
Promotion of Confucian Scholarship
Sejong actively promoted Confucian learning, sponsoring the publication of Confucian classics and encouraging scholarly debates. This strengthened the ideological foundation of Joseon. #Confucianism #Joseon
1423 CE
Military Campaigns Against Jurchen
Sejong launched military campaigns to secure the northern borders against Jurchen tribes, establishing the Six Garrisons (Yukjin) to defend the territory. #Military #Joseon
1429 CE
Publication of Nongsa Jikseol (Straight Talk on Farming)
Sejong commissioned the compilation of agricultural knowledge to improve farming techniques. The book was distributed to farmers to boost crop yields. #Agriculture #Joseon
By 정초(鄭招), 변효문(卞孝文) - http://www.emuseum.go.kr/detail?cateClass=&cateListFlag=&keyword=%EB%86%8D%EC%82%AC%EC%A7%81%EC%84%A4+&pageNum=7&rows=9&reltRows=10&sort=&highQualityYn=&isImgExistOp=&mckoglsvOp=&isIntrstMuseumOp=&filedOp=&detailFlag=&dq=&ps01Lv1=&ps01Lv2=&ps01Lv3=&mcSeqNo=&author=&ps06Lv1=&ps06Lv2=&ps08Lv1=&ps08Lv2=&ps09Lv1=&ps09Lv2=&ps09Lv3=&ps09Lv4=&gl05Lv1=&gl05Lv2=&ps12Lv1=&ps15Lv1=&culturalHerNo=&publicType=&detailedDes=&thema=&storySeq=&categoryLv=&categoryCode=&mobileFacetIng=&location=&facet1Lv1=&facet1Lv2=&facet2Lv1=&facet3Lv1=&facet3Lv2=&facet4Lv1=&facet4Lv2=&facet5Lv1=&facet5Lv2=&facet5Lv3=&facet5Lv4=&facet6Lv1=&facet6Lv2=&facet7Lv1Selected=&facet7Lv1=&facet8Lv1=&gl27Lv1=&gl27Lv2=&gl27Lv3=&gl27Lv4=&gl28Lv1=&gl28Lv2=&gl28Lv3=&gl29Lv1=&gl30Lv1=&mcgpyear1=&mcgpyear2=&mcginves=&mcgchalj=&mcgchams=&facetGL27Lv1=&facetGL27Lv2=&facetGL27Lv3=&facetGL27Lv4=&facetGL28Lv1=&facetGL28Lv2=&facetGL29Lv1=&facetGL30Lv1=&mcgwonpn=&keywordHistory=%EB%86%8D%EC%82%AC%EC%A7%81%EC%84%A4+&showSearchOption=&intrstMuseumCode=&returnUrl=%2FheaderSearch&selectMakerGroup=0&radioSearchCheck=unifiedSearch&headerPs01Lv1=&headerPs01Lv2=&headerPs01Lv3=, Public domain, https://commons.wikimedia.org/w/index.php?curid=172431707
1431 CE
Invention of the Rain Gauge (Cheugugi)
Under Sejong's direction, the first standardized rain gauge was invented to measure precipitation for agricultural planning. It was distributed across the country. #Science #Invention
By Famartin - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=29007033
1432 CE
Construction of the Angbu Ilgu (Sundial)
Sejong commissioned the creation of a hemispherical sundial called Angbu Ilgu, which displayed time and seasonal changes. It was installed in the capital. #Science #Timekeeping
1433 CE
Compilation of Dongui Bogam (Principles and Practice of Eastern Medicine)
Sejong ordered the compilation of a comprehensive medical encyclopedia, which was later completed by Heo Jun. It became a classic of traditional Korean medicine. #Medicine #Joseon
By en:Heo Jun - http://100.nate.com/dicsearch/pimage.html?i=222742003&en=&pg=search&v=44, Public domain, https://commons.wikimedia.org/w/index.php?curid=7430010
1434 CE
Invention of the Water Clock (Jagyeongnu)
The self-striking water clock Jagyeongnu was invented by scientist Jang Yeong-sil under Sejong's patronage. It automatically announced the hours. #Science #Invention
By User:Gapo - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=15361312
1434 CE
Promotion of Movable Metal Type Printing
Sejong improved movable metal type printing, leading to the publication of many books. This advanced literacy and knowledge dissemination in Joseon. #Printing #Technology
By Willi Heidelbach - http://www.sxc.hu/photo/238776; archived copy: stock.xchng - the quick brown fox ... (photo by wilhei66), CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=154912
1437 CE
Creation of the Celestial Globe (Honcheonui)
Sejong commissioned the construction of an armillary sphere and celestial globe for astronomical observation, aiding calendar making and navigation. #Astronomy #Science
By physical object: Jost Bürgi, Antonius EisenhoitPhotograph: Chris Bainbridge - Photograph: Own work, Public domain, https://commons.wikimedia.org/w/index.php?curid=6089012
1438 CE
Establishment of the Bureau of Astronomy
Sejong reorganized the royal observatory and established a bureau dedicated to astronomy, meteorology, and calendar calculation. #Astronomy #Joseon
1441 CE
Invention of the First Rain Gauge (Cheugugi) Standardization
Sejong standardized the rain gauge design and ordered its use nationwide, making Joseon the first country to systematically measure rainfall. #Science #Meteorology
1442 CE
Compilation of Yongbieocheonga (Songs of Flying Dragons)
Sejong commissioned a epic poem celebrating the founding of the Joseon dynasty. It was written in both Classical Chinese and early Hangul. #Literature #Joseon
By Nuyos at English Wikipedia - Transferred from en.wikipedia to Commons., Public domain, https://commons.wikimedia.org/w/index.php?curid=51892809
Dec 1, 1443 CE
Creation of the Hangul Alphabet (Hunminjeongeum)
Sejong and the Hall of Worthies scholars created the Korean alphabet Hangul, originally called Hunminjeongeum (Proper Sounds for Instructing the People). It was designed to be easy to learn. #Hangul #Language #Invention
By metalslick - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=63996191
1444 CE
Publication of Hunminjeongeum Haerye (Explanations of the Correct Sounds)
A detailed commentary explaining the principles and usage of Hangul was published, helping to promote the new script among scholars and officials. #Hangul #Linguistics
By Sejong the Great of Joseon - http://www.cha.go.kr/korea/heritage/search/Culresult_Db_View.jsp?VdkVgwKey=11,00700000,11, Public domain, https://commons.wikimedia.org/w/index.php?curid=4927531
1445 CE
Compilation of Dongguk Tonggam (Comprehensive Mirror of the Eastern Kingdom)
Sejong ordered the compilation of a comprehensive history of Korea, which was completed after his death. It served as a key historical reference. #History #Joseon
By 三猎 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=54605367
Sep 9, 1446 CE
Promulgation of Hunminjeongeum (Hangul)
Sejong officially promulgated the Hangul alphabet, making it available for public use. The script was initially met with resistance from the literati. #Hangul #Language #History
1447 CE
Publication of Worin Cheon-gang Jigok (Songs of the Moon Reflecting a Thousand Rivers)
Sejong wrote a collection of Buddhist hymns in Hangul, showcasing the script's poetic potential and his personal devotion. #Buddhism #Poetry
1447 CE
Publication of Seokbo Sangjeol (Episodes from the Life of Buddha)
Sejong commissioned a biography of the Buddha written in Hangul, demonstrating the script's use for religious texts and promoting Buddhism. #Buddhism #Literature
1448 CE
Compilation of Gyeongguk Daejeon (National Code)
Sejong began work on a comprehensive legal code, which was completed after his death. It codified administrative and penal laws. #Law #Joseon
By 猫猫的日记本 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=53314698
1449 CE
Promotion of Hangul Literature
Sejong encouraged the translation of Chinese classics and Buddhist texts into Hangul, increasing literacy among commoners and women. #Hangul #Literature
Feb 17, 1450 CE
Death of King Sejong
Sejong died at the age of 52 after a long illness. He was posthumously honored as Sejong the Great, one of only two Korean rulers with that title. #Joseon #Death
1450 CE
Posthumous Title 'Sejong' Bestowed
Sejong's temple name 'Sejong' (meaning 'World Ancestor') was given. His reign is considered the golden age of Joseon culture and science. #Joseon #Legacy
1451 CE
Completion of Dongguk Tonggam
The comprehensive history of Korea, commissioned by Sejong, was completed posthumously under his son King Munjong. #History #Joseon
1460 CE
Hangul Suppression by Literati
After Sejong's death, the yangban elite opposed Hangul, considering it vulgar. Its use declined among the upper classes but persisted among commoners and women. #Hangul #History
1504 CE
Hangul Banned Under Yeonsangun
King Yeonsangun banned Hangul after it was used to criticize him. The ban lasted until his deposition, but Hangul survived in private use. #Hangul #Censorship
1894 CE
Hangul Reinstated in Official Documents
During the Gabo Reforms, Hangul was officially reinstated for government documents, marking a revival of Sejong's script. #Hangul #Modernization
By Nuyos - w:en:File:Gungukgimucheo joseokjin.jpg, uploaded to Commons by User:Valentim using Commons Helper, Public domain, https://commons.wikimedia.org/w/index.php?curid=11668664
1910 CE
Hangul Day Established
The Korean language society established October 9 as Hangul Day to commemorate the promulgation of Hunminjeongeum. It became a national holiday. #Hangul #Culture
1926 CE
First Hangul Day Celebration
The first official celebration of Hangul Day was held by the Korean Language Society, promoting the script during Japanese colonial rule. #Hangul #Resistance
1945 CE
Hangul Becomes Official Script of Korea
After Korea's liberation from Japan, Hangul was adopted as the official script of both South and North Korea, fulfilling Sejong's vision. #Hangul #Independence
1997 CE
Hunminjeongeum Registered as UNESCO Memory of the World
The original manuscript of Hunminjeongeum was inscribed on the UNESCO Memory of the World Register, recognizing its historical significance. #UNESCO #Heritage
2007 CE
Sejong the Great Statue Unveiled in Seoul
A large statue of King Sejong was unveiled in Gwanghwamun Square, Seoul, honoring his contributions to Korean culture and science. #Monument #Seoul
2013 CE
Sejong Institute Expansion Worldwide
The King Sejong Institute, a network of Korean language and culture schools, expanded globally, promoting Hangul and Korean culture. #Language #Education
2018 CE
Sejong's Portrait on South Korean Banknotes
Sejong's portrait appears on the 10,000 won banknote, symbolizing his enduring legacy as a cultural icon. #Currency #Legacy
By The Bank of Korea한국은행 - Self-made composite of various images taken from the Bank of Korea website., South Korean currency, https://commons.wikimedia.org/w/index.php?curid=1468060
2020 CE
Hangul Used in Global Pop Culture
The global popularity of K-pop and K-dramas led to increased interest in Hangul, with many fans learning the alphabet. #Hallyu #Language