 Complete the following phrase:  The substructure of the church is ancient, putatively built circa 260-300 as a chapel, perhaps a burial chapel, in a lava cave in use as a cistern, and dedicated to the Virgin Mary. In the seventh century, a church was built atop, once called Santa Maria La Grotta. In the 8th century, the Muslims either demolished or abandoned that structure. The Norman rulers, restores a church and added the large columns of the upper presbytery. The church was razed by the 