, or the State of Usan
, occupied Ulleung-do
and the adjacent islands during the Korean Three Kingdoms period
. According to the Samguk Sagi
, it was conquered by the Silla
general Kim Isabu
. He is said to have used wooden lions or tigers to intimidate the residents into surrendering. Usan-guk rarely enters into historical records, but appears to have continued a largely autonomous existence until its annexation to Goryeo
According to Sejong Sillok, Goryeosa, and Mangi Yoram, Usan-guk consisted of Ulleung-do and Usan-do. Koreans believe Usan-do is Liancourt Rocks (Dokdo in Korea, Takeshima in Japan), although some Japanese scholars dispute the interpretation of some of the records.