sentences:  In the main hall, the original remains of part of the mosaic floor is integrated into the present-day floor, which contains markings of the outer walls of the early Christian building.Soon after it was opened for worship, the church was destroyed in the Lombard invasion.Between the 9th and 11th centuries, two basilicas were erected on the ruins of the old church, the first dedicated to Our Lady of the Assumption and the second, the cathedral, to Saint Justus (San Giusto).