In  spite of the name, the portal is not the ancient gateway to the decumanus maximus, the main east-west road that once led out of Roman Naples to Capua. When the city was extended eastwards in the 15th century as part of the construction of the new Aragonese city walls, the original gate, which had been closer to the castle of the same name, Castel Capuano, was rebuilt and relocated in 1484.
The portal is not actually the ancient gateway to the main east-west road that once led out of Roman Naples to Capua. When the city expanded eastward in the 15th century, the original gate, which had been near Castel Capuano, was rebuilt and moved in 1484.