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 around 350 AD. Slight modifications of the east wall have been dated to around 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 might indicate that the hall was used by Christians.

The building may have been used by the guild of ferry-men that is documented in the adjoining Basilica (I,II,3).