 Complete the following phrase:  King Thammaracha, now reigned at Ayutthaya, appointed his son Prince Naresuan as the Uparaja of Phitsanulok in 1570. In 1584, Prince Naresuan ordered the evacuation of all cities in the Sukhothai region including Phitsanulok down south in preparations against Burmese invasions. Phitsanulok was abandoned until it was later restored in 1593 not as a Uparaja seat but as a Muang Ek or first-level city held by a governor, becoming the center of Siamese administrations in northern regions. The governors of Phitsanulok held the title Chao Phraya Surasi. After the 