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Usan-guk, 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 in 512. 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 in 930. 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. == Old Korean maps == file:八道総図.jpg|Joseon map(1530) file:Ulleungdo and Usando.jpg|Joseon map(1530):Ulleungdo(鬱陵島) and Usan(于山島) file:Gwang Yeodo 18th century.jpg|廣輿圖(Gwang Yeodo,1737-1776) This map showed Ulleungdo with a small island off its eastern shore labeled as "the so-called Usando" (所謂 于山島). file:DaedongyeojidoUlleungdo.png|Kim Jeong-ho"Daedongyeojido"(1861)：Ulleungdo(鬱陵島) and Usando(于山) file:East of Ulleungdo and Usando.jpg|Kim Jeong-ho"Daedongyeojido"(1861)：East of Ulleungdo(鬱陵島) and Usando(于山) file:DaehanJeondo.jpg|A map by Korean Empire:Ulleungdo(鬱陵島) and Usan(于山) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Usan」の詳細全文を読む スポンサード リンク
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