Europeans gave the name 'Liancourt Rocks' to the island after they discovered it in 1849. But using this term is certainly wrong, and the correct term for the island is 'Dokdo'.
South Korea has known about the existence of 'Dokdo' since a very long time ago and countless historical documents support this fact. For example, in Samguksagi, the oldest historical book in Korea, there is a record that Silla called 'Dokdo' as Usando after king Isabu had conquered Usanguk.
Moreover in the 1500s, An Young Bok, who was the Joseon's fisherman during the 17th century, visited Japan and returned with a paper, saying Ulleungdo and Dokdo is the territory of Joseon. In 1900, Dokdo was officially incorporated into Gangwon-do province through the forty-first article of Korea's imperial order. Even some documents in Japan support that 'Dokdo' is the appropriate name and that the territory belongs to Korea.