Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Yi Sun-sin was a Korean naval commander noted for his victories against the Japanese navy during the Japanese invasions of Korea (1592-1598) in the Joseon Dynasty. His title of Samdo Sugun Tongjesa, literally meaning "Naval Commander of the Three Provinces" was to remain as the title of the commander of the operating arm of the Korean navy until 1896. 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 (of at least 23) in which he commanded. Yi was killed by a single bullet in the Battle of Noryang on December 16, 1598. And while he died, he said "Do not let my death be known" (lest the friendly forces lose morale/the enemy gain morale). The royal court eventually bestowed various honors upon him, including a posthumous title of Chungmugong (Martial Lord of Loyalty), an enrollment as a Seonmu Ildeung Gongsin (First-class military order of merit during the reign of Seonjo), and two posthumous offices, Yeonguijeong (Prime Minister), and the Deokpung Buwongun (The Prince of the Court from Deokpung).