 The survivors evacuated to Umongasela City and this district has been abandoned since then.Around 757 CE, Khun Saiphong, one of the sons of Khun Borom of Tai-desa, obliged his people to follow him from northern Myanmar across the Salween to this region.The title "Khun" before his name marks his status as a ruler of a fortified town and its surrounding villages, together called a mueang.