The earliest Satavahana inscriptions belong to the 1st century BCE. In the 1st century BCE the Satavahana defeated the Kanvas and established their rule over parts of central India.
The Capital of Magadh empire was situates at Rajgriha or Girivraja. The city was almost impregnable as it was surrounded by five hills, the openings in which were closed by stone walls on all sides.