Reliquiaries: shapes and contents:
In the middle of the bema was found a piece of limestone, different from the basalt building material. The stone did not belong on that spot, but was brought there and placed on the bare ground. It appears to have been a fragment of the the sacred stone mentioned by Petrus Diaconus, LS V 3, on which, according to tradition, Jesus placed the loaves and fishes. When the chapel went out of use and the basilica was built, part of the stone was removed and placed under the altar of the new structure.