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Mahasthangarh is the earliest urban archaeological sites discovered thus far in Bangladesh. The village Mahasthan in Shibganj upazila of Bogra District contains the remains of an ancient city which was called Pundranagara or Paundravardhanapura in the territory of Pundravardhana. A limestone slab bearing six lines in Prakrit in Brahmi script recording a land grant, discovered in 1931, dates Mahasthangarh to at least the 3rd century BCE. It was an important city under the Maurya Empire. The fortified area was in use until the 8th century CE.