Liancourt Rocks dispute Japan. In 1954, Japan proposed a reference to the International Court of Justice, which South Korea rejected, believing that the Liancourt Rocks are irrefutably South Korean territories, and thus should not be dealt through diplomatic negotiations or judicial settlement between South Korea and Japan. There are conflicting interpretations about the historical state of sovereignty over the islets. Korean claims are partly based on references to a Korean island called "Usan-do" in various historical records, maps and encyclopedias such as the "Samguk Sagi", "Annals of the Joseon Dynasty", "Dongguk Yeoji Seungnam" (), and "Dongguk munheon bigo" (). According to the Korean
Liancourt Rocks dispute view, these refer to today's Liancourt Rocks, while the Japanese researchers of these documents have stated that the various references to Usan-do refer at different times to Jukdo, its neighboring island Ulleungdo, or a non-existent island between Ulleungdo and Korea. Researchers disagree on who first had administrative control over the islets due to ambiguities in early historical records and maps, partly due to changes in the names of the islands in the area over the years. Samguk Sagi ("History of Three Kingdoms") recorded that in 512, the 13th reign year of King Jijeung of Silla, one of the Three Kingdoms