집현전
Yi Hyang was the longest holder of the position of Crown Prince during the Joseon Dynasty, holding the position from 1421 to 1450, a record 29 years. In January 1421, Sejong instructed that the eight-year-old Yi Hyang be educated by ministers from the Hall of Worthies, then in October the same year, he was made crown prince and sent to study at the Sungkyunkwan. From 1442 until his own accession to the throne in 1450, he served as regent to King Sejong.