In addition, the south-eastern apse and the two apses in the west, as well as the arch of the arcosolium
of the burial that was found in the lunette of the north-western blind arch, were all rebuilt according to the preserved north-eastern apse.
Located most frequently in cubicula, roomy underground chambers that were presumably reserved for such worthies, an arcosolium is an arched niche carved from the living rock, its sides either falling clear to the floor to accommodate a sarcophagus or stopping short of that to allow for deposit of a body into a (sealed) cavity in the rectangular mass of unexcavated wall below the arch.
Although they are most often associated with Christian catacombs of the first four centuries of the present era, it is now clear that the arcosolium as a tomb type designated for individuals of high standing had a long subsequent history, generally above ground and set into the walls of church interiors.
Like the trabeated tomb baldachins with pitched roofs of the Late Middle Ages that saw limited favor in Rome and Southern Italy, the arcuated form that triumphed not only on Italian soil but in Northern Europe as well had fully freestanding sources that predate the enfeu wall-tomb and ultimately even the arcosolium.