After the Battle of Sittaung River in 1583, King Naresuan of Phitsanulok forcibly relocated people from the cities of Phitsanulok, Sukhothai, Phichai, Sawankhalok, Kamphaeng Phet, Phichit, and Prabang to the Southern Central plain, due to the war with the Burmese and an earthquake. After crown prince Mingyi Swa of Burma died in single combat at Don Chedi in 1592, these cities were restored, but not as an independent kingdom, but as provinces within the Ayutthaya Kingdom