A handsome city of France, capital of the department of Seine-et-Oise, 11 m. by rail SW. of Paris, of which it is virtually a suburb, and was during the monarchy, from Louis XIV.'s time, the seat of the French court; has a magnificent palace, with a gallery embracing a large collection of pictures; was occupied by the Germans during the siege of Paris, and in one of its halls the Prussian king was proclaimed emperor of Germany as William I.