Usan

Usan-guk or the State of Usan () was a statelet that occupied the island Ulleungdo and several adjacent islands in Korea during the Three Kingdoms period. According to the Samguk sagi, it was conquered by the Silla general Kim Isabu in 512. He is said to have used wooden lions or tigers to intimidate the residents into surrendering. It has been written that the alias of Usan-guk is Ulleung-do. Usan-guk rarely entered into historical records, but appears to have continued a largely autonomous existence until its loss of independence to Goryeo in 930.

==History== ===Historical records=== thumb|280px|right|Samguk sagi Book 04. Silla's Records. In 512, Usan-guk（于山國）was Ulleungdo（鬱陵島） Earliest records that appear in the Records of the Three Kingdoms indirectly attest the existence of the kingdom, which says "When Wang Qi () (of Cao Wei) has come to Okjeo to conquer Kung (Dongcheon of Goguryeo), he asked a local man whether there are people living in the east sea, and the man replied there are people living in an island that exists in the eastern seas, and they select a girl to put in the ocean every July."