A venerable walled city of Italy; once a seaport, now 5 m. inland from the Adriatic, and 43 m. E. of Bologna; was capital of the Western Empire for some 350 years; a republic in the Middle Ages, and a papal possession till 1860; especially rich in monuments and buildings of early Christian art; has also picture gallery, museum, library, leaning tower, etc.; manufactures silk, linen, paper, etc.