The church , at the north - west of the archaeological site , also in the vicinity of the messapic walls , consists of an upper compartment which corresponds to a composite underground crypt . The underground facility, accessible by a staircase of steps seems to reuse part of a pre-existing chamber tomb of the classical era , similar to several examples , in the same province of Taranto , reuse of ancient tombs transformed , in the medieval period , in places of worship " hermit . " In the case of St. Peter Mandurino appear to support the conformation of access , right to the end of the dromos with the scale and, although poorly preserved, the decoration in red bands of the time of the presumed grave. The original classical monument , which would bebe the only specimen of chamber tomb in the archaeological area of Manduria , consisted of a stepped dromos, a small corridor covered half-barrel and a quadrangular space contrapposto.Il corridor was expanded to the east and west to religious purposes , transformed in a crypt of the central pattern Byzantine chapel and holy bema scores , of course, by a wooden iconostasis . Isolated , next to the south, the original space of the classical tomb . The different rooms of the crypt are the frescoed niches , perhaps heavily repainted in the nineteenth century.