Yi Eok-gi (3 September 1561– 27 August 1597) was the commander of the Eastern Jeolla Fleet and later came to be the commander of the Western Jeolla Fleet. At age 32, despite being 15 years younger than Supreme Naval Commander Yi Sun-sin, Yi Eok-gi became his most trusted commander and companion during the Seven Year War. Yi Eok-gi was eventually killed in the devastating Battle of Chilcheollyang Strait while assisting Won Gyun, the Naval Commander of the entire Korean navy at that time.