In 1983, south of Basilica High Priest Peter's atrium, was discovered the baptistery that by the drawing and his dimensions is considered unique in the Hellenic space.
The “Fotistirio” (illumination) in the east is square and it surrounds elevated circular pillar in which they stepped eight columns. In the center octagonal baptistery. Impressive marble inlay on the floor. Epigraph on the west doorsill of the circular pillar, mentions that the constructor or donator of this layer was Polyhronios «for wish». Western of “Fotistirio” (illimination) there is a three aisled “outer” house.
It is probable that the baptistery is considered contemporary to the first Basilica of High Priest Peter
The called Episcopical mansion is situated in the 100 m. western the Basilica of Saint Dimitrios. It was discovered in the 1937,.1939 and 1954 by G. Sotiriou, in 1972 they came into light from the P. Lazaridis other departments of the building. It was two-storied and had important sculptural decor. It belongs in the after Roman times and it was maintained however and used until the 7th century a.C.