King Sejong was Joseon’s fourth monarch, who caused Korea to enjoy an unparalleled expanse of culture and the arts. King Sejong was enthroned with King Taejong (r. 1400-1418) ’s great trust and senior statesmen’s entreaties. Under his rule, the royal academy invented the Korean alphabet or Hunminjeongeum. Sejong’s monarch marked a “Goledn age” in Korean history.