Porta Aenea or the Brass Gate

led from the south to Diocletian's Palace. Originally, the gate had a defensive function. In case of an attack on the palace from the land, it was possible to get directly to the waterfront through underground corridors. Today it is a tourist attraction - most trips to Diocletian's Palace start from passing through the brass gate. The architectural design of the palace is modeled on the Castrum Romanum - a fortified camp of Roman legionaries.

Due to its functions, the southern entrance to the palace was also called a secure gate. Apart from it, the monumental estate of the emperor had three other entrances: the Iron Gate (Porta Ferrea) to the west, the Golden Gate (Porta Aurea) to the north and the Silver Gate (Porta Argentea) to the east.