The Hall of the Good Shepherd is located to the north-west of the Basilica (I,II,3). It was created through the addition of a wall in opus vittatum with a huge wall-niche, built c. 350 AD. Slight modifications of the east wall have been dated to c. 400 AD.

On the floor are remains of a white mosaic and reused marble. On the walls are traces of plaster. The hall was named after a column with a relief of the Good Shepherd, found here during the First World War. It seems to have supported something. The Good Shepherd indicates that the hall was used by Christians, possibly the ferry-men, who used the Basilica as guild seat.