A postern gate, situated in the eastern sector of the Augustan town walls of Iulia Concordia, has been excavated during a series of campaigns between 1998 and 2011. This was the second gate after that found a little further north, close to a large bath complex. The quadrangular brick-built gate had two aligned archways, and opened in the walls, whose line was identified for short stretches on either side. Inside the walls, a basalt-paved _decumanus_ was investigated, which sloped slightly upwards in the direction of the town centre. Outside, there was an area of low ground which had been subject to reclamation immediately before the erection of the structures. A vaulted cloaca ran below the _decumanus_, which once outside the walls was replaced by a small brick-built sewer. In the Late Antique period, the two archways were narrowed so as to admit only pedestrian traffic, and the roadbed was occupied by modest structures and a stairway built of reused materials from the road and the walls. The excavation’s important results have led to a project for the opening of the area to the public as part of the town’s archaeological circuit.