The southern sea gate (the "Porta Aenea") was simpler in shape and dimensions than the other three, and it is thought that it was originally intended either as the emperor's private access to the sea, or as a service entrance for supplies.
The southern Sea Gate ("Porta Aenea") was simpler in shape and dimensions than the other three. Perhaps it was originally intended as the emperor's private access to boats, or as a service entrance for supplies.