In early Christian period the entire southern part of the hill temple was occupied by a large necropolis, a sign that the urban perimeter was significantly reduced. On the same walls, tombs arcosolium were carved, surmounted by a niche that is arched carved into the rock; in the underground, reusing the oldest tanks in several cases, were dug underground tombs, among which the largest is the underground Fragapane. This catacomb, with an access corridor carved into the rock, which runs through the necropolis sub divo, spread from north to south in a series of rounds, often derived from the Greek era tanks re-used for funerary use; within the same rounds and corridors they are made burials trapezoidal enclosures (formae) and arcosolium. Around the entrance of this underground is visible a large sector of the necropolis sub divo, that is in the open.
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