Marquess of Gaeseong

Marquess Gaeseong (d. 1062), personal name Wang Gae was a Korean Royal Prince as the third and youngest son of Jeongjong of Goryeo and Queen Yongui. Due to his father's death when he was young, so he was raised and brought up into the Palace by his half-uncle, Munjong of Goryeo.

In 1052, he became the preceptor in Dongsam Temple, Gaebu and appointed as Sangseoryeong to work in Sangju State with his new title as Marquess Gaeseong. At the same time, he also received 2.000 sik-eup. Then became Jainborijwahwagongsin. He later died in 1062 and received his posthumous name Sinsang.