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The origins of Bellagra are lost in time and according to legend, all cities with a fortified acropolis with polygonal walls were built by the god Saturn. Polygonal or Cyclopean walls are built with large irregular stones, placed one above the other, whose shapes fit together nearly perfectly.

They can be traced back to the seventh century BC. The remains of these walls can be seen in the town centre in Piazza San Sisto.