The history of Phitsanulok could be traced back to time when the oncient Khmer influenced the reglon. As one of Thailand’s Important historic provinces, The old Phitsanulok town, Know as Muang Song Khwai, was located between the Nan River and the Khwai Noi River, about 5 kms south of the present town. Because of the change of its flowing route, the present Khwai Noi Tiver is approximately 10 kms away from the town. Currently, at the location of Muang Song Khwai is situated Wat Chutlamani, a well-established monastery of the province.