Jejudo Island had been governed as three areas for five centuries upon the suggestion of O Sik‚ a royal court inspector in the 16th year of the reign of King Tejong (1416) of the Joseon Dynasty․
Jejudo Island had been governed as three areas for five centuries upon the suggestion of O Sik‚ a royal court inspector in the 16th year of the reign of King Tejong (1416) of the Joseon Dynasty․