Castrogiovami, Or Castro Giovanni (Anc. Enna, from one form of the name of which, Castrum Ennce, corrupted by the Arabs to Cassar Janna, the modern designation comes), a city of Sicily, in the province and 13 m. N. E. of Caltanisetta; pop. about 15,000. It is situated on the level summit of a precipitous and rocky height in the centre of the island, 4,000 ft. above the sea, and is the highest inhabited site in Sicily. Its situation rendered it in ancient times one of the strongest natural fortresses in the world, and during the middle ages it bore the name of l'Inespugndbile (the Impregnable). The appearance of the modera town is mean and wretched; the dwellings are generally dilapidated, and have a dingy and stained appearance largely attributable to climatic influences. The old feudal fortress of Enna, erected in the 13th century by Frederick II. of Aragon, is the chief edifice. The height of Enna was the fabled birthplace of Ceres, and the site of her most famous temple. About 5 m. distant is the lake of Pergusa, where Proserpine, according to the poets, was carried off by Pluto. During the first servile war, about 100 B. C, the insurgent slaves made Enna their headquarters.