Crown Prince Jeongseong
| Wang Seok | |
|---|---|
| Prince Jeongseong (정성군; 定城君) | |
| Reign | 1388–1389 |
| Coronation | 1388 |
| Crown Prince of Goryeo | |
| Reign | 1389 – July 1392 |
| Coronation | 1389 |
| Predecessor | Crown Prince Wang Jeong |
| Successor | Dynasty abolished (Yi Bangu as the first Crown Prince of Joseon) |
| Monarch | King Gongyang (father) |
| Born | Wang Dan 1370 Goryeo |
| Died | 1394 (aged 24) Samcheok, Gangwon Province, Joseon |
| Spouse |
Crown Princess Consort of the Incheon Yi clan
(m. 1391–1394) |
| House | House of Wang |
| Father | Gongyang of Goryeo |
| Mother | Royal Consort Sun of the Gyoha No clan |
| Religion | Buddhism |
| Korean name | |
| Hangul | 왕석 |
| Hanja | 王奭 |
| RR | Wang Seok |
| MR | Wang Sŏk |
| Royal title | |
| Hangul | 정성세자 |
| Hanja | 定城世子 |
| RR | Jeongseong seja |
| MR | Chŏngsŏng seja |
| Former names | |
| Hangul | 왕서, 왕단 |
| Hanja | 王瑞, 王瑞 |
| RR | Wang Seo, Wang Dan |
| MR | Wang Sŏ, Wang Tan |
Crown Prince Jeongseong (ca. 1370–1394) or known before as Prince Jeongseong, was the first son of King Gongyang and Consort Sun who would eventually become the last Crown Prince of the Goryeo dynasty. After Yi Seonggye established the new dynasty, he was deposed from his throne along with his parents and got assassinated. His birth name was Wang Dan (왕단; 王瑞), but later changed to Wang Seok (왕석; 王奭) whom he was better known as.