Norba, an ancient town of Latium (Adjectum), Italy. It is situated 1 mile northwest of the modern town of Norma, some 1575 ft. above sea-level, on the west edge of the Volscian Mountains or Monti Lepini. The town is perched above a precipitous cliff with a splendid view over the Pomptine Marshes below. It was a member of the Latin League of 499 BC, and became a Latin colony (colonia) in 492 BC, serving as an important fortress guarding the Pomptine Marshes. It served in 199 BC as a place of detention for the Carthaginian hostages, and was captured and destroyed by Sulla's troops during the civil wars at the end of 82 BC. Some revival in prosperity took place later.
From excavations begun in 1901 it seems clear that the remains now visible on the site are entirely Roman. The well-preserved walls are in the polygonal style, over 2.5 km in circuit, and are entirely embankment walls, not standing free above the internal ground level. The walls enclose an area of approximately 38 hectares. Remains of two towers, and of several gateways (notably the Porta Maggiore, defended by a tower) exist. The bastion at the Porta Maggiore still stands to 13 m. The main gate is enormous, with jambs over 8 m in height, 4.30 m in width, and internal width of 12.8 m. Within, the remains of several, buildings, including the substructions of two temples, one dedicated to Juno Lucina, have been examined. At the foot of the cliff are the picturesque ruins of the medieval town of Ninfa a (12th-13th centuries) abandoned owing to the malaria. The remains of a primitive settlement, on the other hand, have been discovered on the mountain-side to the S. E., above the 13th-century abbey of Valvisciolo, where there is a succession. of terraces supported by walls of polygonal work, and approached by a road similarly supported. Here a quantity of primitive Latin pottery has been found. The necropolis of this settlement was probably the extensive one situated at Caracupa (8th-7th century BC), near the railway station of Sermoneta, which belongs also to the 8th-6th century BC, terminating thus at the precise date at which the Roman city of Norba began to exist.