Ssangseong

Ssangseong was a Yuan prefecture at Hwaju in northeastern Korea, established in 1258 and governed hereditarily by the Cho family. Its superintendent in 1337 was Cho Rim.

As Yuan power weakened, King Gongmin of Goryeo sought to recover the region. In 1356 his general Yu In-u took the prefecture, while Cho Ton and the local commander Yi Chach'un sided with Goryeo; Yi's young son Yi Sŏnggye also joined him. The territory returned to Goryeo, and Yi Sŏnggye later founded the Joseon dynasty.