that his eight-year-old son be educated by scholars from the Hall of Worthies, then in October the same year, he was invested as crown prince and sent to study at the Sungkyunkwan. From 1442 until his own ascension to the throne in 1450, Yi Hyang served as regent and took care of state affairs during the final years of his father's reign, as Sejong developed various illnesses and disorders.

Most of his achievements