At the eastern end of the pier platform of the southern harbour, the remains of a small church/chapel measuring 11.4 x 5.2 m adjacent to the breakwater wall were unearthed. The church, with a rectangular narthex at its western entrance, has two naves ending with a double apse to the east. The church is dated to the 10th – 12th centuries AD by both the architecture and the pottery finds. Outside the eastern part of the church apses, there is a floor paved with square-shaped terracotta tiles and a larger double apse foundation that bounds this floor from the east. This suggests that the smaller inner church/chapel was built on top of an earlier, slightly larger church with a similar plan. This slightly larger church from the previous period is dated to the 6th-7th centuries AD, based on the pottery and amphora fragments found around it.
