Yi Pangsŏk, Grand Prince Ŭian
| Yi Pangsŏk 이방석 | |
|---|---|
| Crown Prince of Joseon | |
| Tenure | 7 September 1392 – 6 October 1398 |
| Successor | Yi Panggwa |
| Born | 1382 Gaegyeong (now Kaeseong, Kaesong Industrial Region), Goryeo |
| Died | 6 October 1398 (aged 16–17) Hanseong, Joseon |
| Burial | |
| Spouse | Deposed Crown Princess Consort Hyeon of the Ryu clan
(died 1393)Crown Princess Consort Hyeon of the Cheongseong Shim clan
(m. 1397–1398) |
| Issue | Yi Won-sun |
| Father | Taejo of Joseon |
| Mother | Queen Sindeok |
| Korean name | |
| Hangul | 이방석 |
| Hanja | 李芳碩 |
| RR | I Bangseok |
| MR | I Pangsŏk |
| Royal title | |
| Hangul | 의안대군 |
| Hanja | 宜安大君 |
| RR | Uian daegun |
| MR | Ŭian taegun |
Grand Prince Ŭian (Korean: 의안대군; Hanja: 宜安大君; 1382 – 26 August 1398), birth name Yi Pangsŏk (이방석; 李芳碩), was a Korean crown prince. Born of Queen Sindeok, he was the eighth and youngest son of Taejo of Joseon and the first crown prince of Joseon.
Grand Prince Ŭian was appointed as the first crown prince of the Joseon Dynasty in 1392, but was subsequently deposed following the first strife of princes. He was exiled and was later assassinated in October 1398 at a young age. He was later given the posthumous title Sodo (소도; 昭悼).