 Usando is drawn to the west of Ulleungdo, which is clearly an error since there exists no island that to the west of Ulleungdo.From the early fifteenth century to the aftermath of the Japanese invasions of Korea (1592–1598), the Joseon court was unable and unwilling to maintain a civilian population on either Ulleungdo or Usando.According to the "Taejong Sillok" ("Annals of King Taejong"), the mainland government forcibly evacuated the islands during Taejong's reign, in accordance with the "vacant island policy".