| Queen Sapyeong 사평왕후 | |
| Succession: | Crown Princess of Goryeo |
| Reign: | 3rd month 1174 – 12th month 1174 (lunar calendar) |
| Reign-Type: | Tenure |
| Coronation: | 1174 |
| Predecessor: | Crown Princess Wang |
| Successor: | Crown Princess Yu |
| Father: | Yi Ui-bang |
| Mother: | Lady Jo |
| Issue: | Princess Suryeong |
| Birth Date: | 1158 |
| Birth Place: | Jeonju, North Jeolla Province, Goryeo |
| Death Date: | 1174 |
| Death Place: | Goryeo |
| Posthumous Name: | Sapyeong (사평, 思平; "Thoughtful and Peaceful") |
| House: | Jeonju Yi clan |
| Religion: | Buddhism |
Queen Sapyeong of the Jeonju Yi clan (; 1158 – ?) was the first and primary wife of King Gangjong of Goryeo when he was still a crown prince who just reigned for 9 months. Descended from Yi Yong-bu, she would become the first cousin fifth removed to Yi Seonggye and only royal wife in Korean history who was born and came from the Jeonju Yi clan.
The future Queen Sapyeong was born into the Jeonju Yi clan as the only daughter of Yi Ŭi-bang,[1] son of Yi Yong-bu and Lady Cho in Jeonju, North Jeolla Province.
In 1174, she married Crown Prince Wang Suk as his primary and first wife since her father had a big influence in the court. However, after 5 months reign, her father was assassinated in the coup led by Chŏng Kyun,[2] son of Chŏng Chung-bu,[3] which she later expelled from her position and out the palace according to the opinion that,
"You cannot have the rebel's daughter as a spouse and companion for you."
"반역자의 딸을 동궁의 배필로 둘 수 없다."
After her husband's ascension to the throne, she then received her title back and posthumously honoured as a Queen Consort. The couple had a daughter who later married Wang Ch'un, Duke Hawon .[4] [5]
After that, her whereabouts has not appeared in both of Goryeosa or Goryeosajeolyo.