By the order of the Mongol Court, Wonjong moved the capital from Ganghwa Island to Kaesŏng. Regaining power from military officials with the support of the Mongols, the king decided to abolish the Sambyeolcho (삼별초, 三別抄). Resentful of the peace terms worked out with the Mongols, the Sambyeolcho, led by Bae Jungson (배중손, 裴仲孫), revolted against the government. Systematically blocking passage between Gangwha and the mainland, they brought nearby islands and coastal regions under their domain. Wang On, a royal kinsman was proclaimed king of the maritime kingdom. They gave up Ganghwa Island and fled to Jindo Island in the southwest.