Sejong the Great (as Crown Prince)

Timeline

1. 1401–1408Hanseong · HanseongReceived instruction in the classics, history, archery, and horsemanship at the royal palace in Hanseong from childhood; his elder brother Grand Prince Yangnyeong was the legal heir. Already showed diligence, curiosity, concern for farming and sericulture, and an interest in phonology, foreshadowing his later scholarly style of rule.
2. 1409–1410Hanseong · HanseongAfter Taejong deposed his elder brothers Yangnyeong and Haorang, Yi Do was made crown prince. From 1409–1410 he began observing some state affairs and attending royal lectures, encountering topics in phonology, astronomy, and agricultural policy, accumulating governing experience ahead of his accession in 1418.
3. 1411–1418Hanseong · JoseonAs crown prince he assisted Taejong and the retired king in handling state affairs; after Taejong abdicated in 1418 he ascended the throne at Gyeonggijeon, taking the posthumous name Sejong and inaugurating Joseon's golden age of culture.