Pozzuoli (anc. Puteoli), a town of Italy, on a bay of the same name, in the province and 6 m. W. of the city of Naples; pop. about 10,-000. It is celebrated for its antiquities, which comprise an amphitheatre, one of the largest of its kind; a Serapium, or temple of Serapis; the upper part of a temple of Neptune; a temple of Diana, consisting of a bathing hall; the villa Licastro, called the temple of Antinous after the statue discovered there; and ruins believed to be those of Cicero's villa. In the vicinity are many vestiges of ancient roads, covered with ruined tombs. About 1 m. N. E. of Pozzuoli is the Solfatara (anc. Forum Vulcani), the crater of a semi-extinct volcano. Aluminous waters springing from Mount Sic-cino, and known as the Pisciarella, are re' garded as identical with tfie mineral springs of antiquity. - The ancient Puteoli was a Cam-panian city of Greek origin, which despite the distance from Rome virtually constituted its most useful harbor. Before Roman times, merchants of Tyre had establishments there; the natural advantages of the situation, and the protection of the harbor by a still visible mole, made Pozzuoli a great centre of trade and navigation.

It was at the same time a favorite resort, like Baise on the opposite side of the bay, and prospered until after the reign of Honorius. . Wars and repeated volcanic eruptions in the 12th and 16th centuries finally extinguished the importance of the place.