According to the
Ayutthaya Testimonies, in 1156, a monarch of
Xiān named
Suryaraja was recorded to have transferred his royal seat to Vicitraprakāra, identified with present-day Kamphaeng Phet, thereby designating it as the principal center of his dominion. His successor and son,
Candraraja, later relocated the seat of power to
Sukhothai, rendering Kamphaeng Phet a frontier stronghold of the kingdom. Chakangrao was built on the east bank of the
Ping River while Nakhon Chum was built on the west bank of the Ping River. When the municipality was established, it had an operation area of 4.5 square kilometers. Later in 1966, it expanded to an area of 14.9 square kilometers. == Demographics ==