name: Cava do Viriato Timeline: Century II or Ia. C. Description: "Title attributed to an unusual fortification to the north of the city, perfect octagonal, surrounded by walls, embankments and a moat, with an indoor area of 39 hectares. Was a Roman military camp, the permanent, the mid-first century BC According to the historian Jorge Alarcão, its construction can be attributed to Decimus Brutus Junius (138 BC) or Caesar (61 BC) or Cassius Longinus or Petreio (48 BC).