贵由
In 1247, the Mongols began the fourth campaign against Goryeo, again demanding the return of the capital to Songdo and the Royal Family as hostages. Güyük sent Amuqan to Korea and the Mongols camped near Yomju in July 1247. After the king Gojong of Goryeo refused to move his capital from Ganghwa island to Songdo, Amuqan's force pillaged the Korean Peninsula. With the death of Güyük Khan in 1248, however, the Mongols withdrew again. But the Mongol raids continued until 1250.