Tivoli tē´vōlē [key], Lat. Tibur, city (1991 pop. 52,372), in Latium, central Italy, on the Aniene River. An important tourist center, the city is beautifully situated on a terrace dominating nearby Rome and the plain to the sea. It is celebrated for the waterfalls formed there by the Aniene and for the Villa d'Este . An old settlement, Tivoli was conquered by Rome in the 4th cent. BC and became a favorite summer resort under the Empire. There are ruins of several Roman villas, notably that of Emperor Hadrian, and the well-preserved Temple of Vesta, which is now a church. The city also has a cathedral (12th cent; rebuilt 17th–18th cent.), with a fine Romanesque campanile.

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