Grand Prince Jinan (Korean: 진안대군; Hanja: 鎭安大君; 1354 – 15 January 1394), personal name Yi Bang-u (이방우; 李芳雨), was a nobleman during the late Goryeo dynasty who become a prince of Joseon as the first son of King Taejo and Queen Sinui.
In year 1388, his father, King Taejo, overthrew Goryeo dynasty.
In 1392, when King Taejo was giving out titles, his first son became as known as Grand Prince Jinan.
In the annals of Joseon dynasty, it describes Grand Prince Jinan as a man who liked alcoholic beverages, and states that he drank copious amount until he died.
When he grew older, he minded in literature and practiced humble life style and did not fancy wealth nor authority."