| Princess Seungdeok 승덕공주 | |
| Birth Date: | 1128 |
| Birth Place: | Goryeo |
| Spouse: | Wang Ki (m. 1145); third cousin |
| Spouse-Type: | Husband |
| Issue: | Wang Sŏng Wang Pak Wang P'yŏng |
| Royal House: | Wang |
| Father: | Yejong of Goryeo |
| Mother: | Queen Sundeok of the Gyeongwon Yi clan |
Princess Seungdeok (; 1128 – ?) was a Goryeo Royal Princess as the first and oldest daughter of King Yejong and Queen Sundeok,[1] also the first sister of King Injong.
It seems that she was born in 1128 and was the paternal aunt of Uijong of Goryeo, Myeongjong of Goryeo and Sinjong of Goryeo. Her maternal grandfather was Yi Cha-gyŏm from the powerful Gyeongwon Yi clan. In 1124 (2nd year reign of her older brother), she was honoured as Princess Jang and then married Wang Ki, Count Hannam . After her death, she was posthumously honoured Princess Seungdeok .[2]
Her husband, Wang Ki was the son of Wang Chŏng, Count Seunghwa who was a grandson of King Jeonggan, one of King Hyeonjong's son. Ki's mother was Princess Heungsu who was actually Seungdeok's aunt. So, the princess and her husband were first cousins. Together, they had 3 sons and 1 daughter.[3]