The name Oplontis is only in the Tabula Peutingeriana, a medieval copy of an ancient map showing the road network in Italy during the Roman Empire. In this paper the name Oplontis indicates some structures positioned between Pompeii and Herculaneum. The main monument, the only one open to visitors, is the villa of Poppea, second wife of Nero, but in any case falls within the heritage of the imperial family.