capital of an arrondissement of the same name, department of Vaucluse, France, on the Azzon, 15 miles N.E. of Avignon. It is well built; but the streets are mostly narrow and filthy. It is surrounded by old walls. Public buildings, the cathedral, rebuilt in 1405; a palace of justice, formerly the episcopal palace; an aqueduct of 48 arches, finished in 1734; a hospital; and the remains of a Roman triumphal arch. It has a theatre, public library, and museum; also distilleries, dye-works, tanneries, chemic works, and a considerable trade in silk, madder, honey, wax, olive oil, &c. It was anciently an important Roman city. Pop. (1851) of city 10,473, of arrondissement 57,034.