Thonburi Kingdom
Bang Saphan dates back to the Ayutthaya Kingdom. In the Thonburi Kingdom, it was named "Mueang Kamnoed Nopphakhun". King Nangklao (Rama III) of Rattanakosin established Kamnoed Nopphakhun as a fourth-class city under the "Kalahom" (defence ministry). King Chulalongkorn (Rama V) downgraded the city to Mueang Kamnoed Nopphakhun District. In 1915 King Vajiravudh (Rama VI) renamed the district by removing the word "Mueang" off. Later the king changed the name to "Bang Saphan".