The building consists of a house conjoined to a separate hall-like room, which functioned as the meeting room for the church. The surviving frescoes of the baptistry room are probably the most ancient Christian paintings. We can see the "Good Shepherd" (this iconography had a very long history in the Classical world), the "Healing of the paralytic" and "Christ and Peter walking on the water". These are the earliest depictions of Jesus Christ ever found and date back to 235 AD.