PISÆ, a town of Etruria, which gave name to the bay of Pisa, Sinus Pisanus.
PLACENTIA, a town in Italy, now called Placenza, in the duchy of Parma.
PLANASIA, a small island near the coast of Etruria, in the Tuscan Sea; now Pianosa.
POMPEII, a town of Campania, near Herculaneum. It was destroyed by an earthquake in the reign of Nero.
POMPEIOPOLIS: there were anciently two cities of the name; one in Cilicia, another in Paphlagonia.
PONTIA, an island in the Tuscan sea; a place of relegation or banishment.
PONTUS, an extensive country of Asia Minor, lying between Bithynia and Paphlagonia, and extending along the Pontus Euxinus, the Euxine or the Pontic Sea, from which it took its name. It had that sea to the east, the mouth of the Ister to the north, and Mount Hæmus to the south. The wars between Mithridates, king of Pontus, and the Romans, are well known.
PRÆNESTE, a town of Latium to the south-east of Rome, standing very high, and said to be a strong place. The town that succeeded it, stands low in a valley, and is called Palestrina.
PROPONTIS, near the Hellespont and the Euxine; now the Sea of Marmora.
PUTEOLI, a town of Campania, so called from its number of wells; now Pozzuolo, nine miles to the west of Naples.