Baptistery of St. John the Baptist (Thessaloniki)

The Baptistery of St. John the Baptist of Thessaloniki, considered as the oldest early Christian baptistery and assigned to the building complex of five-aisled basilica of the Episcopal fifth century.

The baptistery identified at the excavations of the Byzantine church of Hagia Sophia. It consists of a room with platforms and includes a font. It was in direct contact with the royal in the 5th century from the hallway with a mosaic floor.