Built: Around 360/370 AD

After abandoning the legionary camp, the Romans rebuilt and shortened the walls of the Roman civilian town from the 3rd century. The gap left by the removal of the camp wall was closed with stone material from demolished buildings. The Roman city gate was built above the road.

The road surface was part of the Via praetoria, which connected the main gate of the camp, the Porta praetoria, with the staff building.

The gate probably had a square floor plan. Above the passageway, it rose two stories high, with about three windows on each side. Originally, it could be closed with two large wooden gate wings. These were part of a gate tower that was significantly taller than the city wall.

The remains of the Roman city gate have been integrated into the green spaces of the Kupferbergterrasse residential complex. The diagonally laid red sandstone paving stones between the double-shell ashlar masonry sections have been preserved. They are easily accessible to visitors.