Right and Left
In 1593, Admiral Yi was appointed to command the combined navies of the three southern provinces with the title "Naval Commander of the Three Provinces" (삼도수군통제사; 三道水軍統制使) which gave him command over the Right and Left Navies of Jeolla province, the Right and Left Navies of Gyeongsang province, and the Navy of Chungcheong province.