Yi Sun-sin (April 28; 1545 - December 16; 1598) was a Korean naval commander noted for his victories against the Japanese navy during the Imjin war in the Joseon Dynasty. Yi is also known for his innovative use of the 'turtle ship'. He is reputed to be one of the few admirals to have been victorious in every naval battle in which he commanded. Yi was killed by a single bullet in the Battle of Noryang on December 16; 1598. Yi remains a venerated hero among Koreans today.