Nakhon Sawan has been an important city since Sukhothai period. Its name appeared for the frst time on King Ramkhamhaeng’s frst stone inscription as “Mueang Prabang”, which was a frontier of the capital with an important role of protecting the city during wartime until Rattanakosin period. Afterwards, the name was changed to “Chon Tawan” since the town was located on the west bank of Chao Phraya River causing the sun to shine onto the front of the city. However, after being moved to the west side of Chao Phraya River, the name was changed into “Nakhon Sawan”, which means the land or the town of abundance as paradise. Additionally, Nakhon Sawan is also called “Mueang Pak Nam Pho” by local people. This name came from the fact that this city is the area where Kwae Nan (Nan River and Yom River) and Kwae Ping (Ping River and Wang River) meet and blend into Chao Phraya River.