History    The name "Phetchabun", as appears in the historical evidence found by the Department of Fine Art, originates from the word "Phuechapura" which means plenty of crops. However, the name was changed into "Phetchabun" which means plenty of diamonds.    This province is considered to be the ancient city which was built in two different periods in the same area. Wat Mahathat including other ancient temples indicate that the first period of Phetchabun was found during Sukhothai Kingdom. T The Department of Fine Arts declared the wall and the forts as the archaeological sites on 8 March B.E. 2478.