The Porte d'Arroux is the northern gate of the original Roman city, built in the 1st century BC and remarkably well preserved for its 2,000-year age. Like the Porte Saint-André to the east, it has four archways at street level — two large ones for carts and two smaller pedestrian passages — with a Corinthian arcade above. The gate stands at the point where the road from Rome entered the city.
Today it sits at the edge of the old town on a busy through-road. The Roman stonework is weathered but complete, and the gate is best appreciated in the late afternoon when the light picks out the carved detail. A short walk northeast of the cathedral, it makes a natural bookend to the Porte Saint-André on the other side of town.