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Inside the San Rufino cathedral it is possible to visit the cistern, which is perfectly preserved. The tub measures m 7,6 x 5,06 at the floor; m 2 from the grade plane up to the shutter of the arch, retracted by a horizontal tooth of 35, on which a water drain (coming from a well above) is hollowed out. Its absolutely simple frame ripples a travertine decoration at a height of 4 metres. Here, a round vault has been built, of a maximum height of m 7,47, whose seams are not perfectly matching. The floor of the cistern is water tight, thanks to the cocciopesto (lime mortar with crushed bricks), a Roman peculiarity. On the planking level, a limestone monolith works as parapet “all’invaso”, which was probably a fountain for everyday use and for rituals. The artifact lost its function over the centuries and became a base for the bell tower of the medieval cathedral. A magnificent wall made of travertine ashlars, continues towards the east for dozens of metres (corresponding to the left aisle). It continues on the west side and is visible in the museum below ground.
The inscription above the arch, rich with information, is partly hidden by a sixteenth-century retaining structure of the church:
POST MIMESIUS C F MIMESIUS SER F NER CAPIDAS C F RUF NER BABRIUS T, C CAPIDAS T F C N, V VOISIENUS T F MARONES MURUM AB FORNICE AD CIRCUM ET FORNICEM CISTERNAMQ D S S FACIUNDUM COIRAVERE
I MARONI POSTUMIO MIMESIO SON OF CAIO, TITO MIMESIO SON OF SERTORE, NERO CAPIDAS SON OF CAIO, RUFIO NERO BABRIO SON OF TITO, CAIO CAPIDAS SON OF TITO, NEPHEW OF CAIO, VIBIO VOISIENO SON OF TITO TOOK CARE OF THE CONSTRUCTION OF THE WALLS FROM THE ARCH TO THE CIRCUS AND FROM THE ARCH TO THE CISTERN, AFTER A DECREE BY THE SENATE
It certifies the location of the artifact and the existence of a local magistrate, the Marones, during the Roman supremacy, confirming the importance of water for the city of Assisi.