The City Walls and Moats of Phitsanulok were constructed in the Ayutthaya era by King Borom Trailokanat (15th Century). The walls were constructed from brick and clay, similar to the Sukhothai era’s construction to prevent attacks from the Lanna and Burmese kingdoms. The city walls were destroyed early in the Rattanakosin era and were demolished by King Rama I to prevent enemies from using the walls as shelter. The best evidence of what remains is located near the river at Wat Poethiyan.