Marseilles is the military centre for the departments of Basses-Alpes, Alpes-Maritimes, Corse, Vaucluse, Bouches-du-Rhône, Gard, Var, and Ardèche. It is the head-quarters of the 15th Army Corps, and is a naval station as well. It has been a place of commercial importance from the earliest days, and, situated as it is in one of the healthiest districts of France, as well as being on the coast, it forms an ideal military station. In former times it was subject to epidemic diseases on account of the sub-tropical nature of the climate, but modern methods of sanitation have neutralised this drawback, and Marseilles is now as pleasant a place as any that a conscript can hope for in order to undergo his term of service. It is the principal port of France, and as such is strongly fortified, but its fortifications belong to the naval administration of the Republic. Historically, Marseilles dates back to the year 600 B.C., when the Greeks established a colony here. It passed to Roman rule at the time of the invasion of Gaul and became connected with, among other notable Romans, Petronius, the arbiter of elegance at Nero's court. Throughout the Middle Ages Marseilles enjoyed a semi-independence, and it has always played a prominent part in the history of the Mediterranean sea-board. Montpellier, the head-quarters of the 16th Army Corps, is the military centre for the departments of Aude, Aveyron, Hérault, Lozère, Tarn, and Pyrénées-Orientales. It is about 480 miles south of Paris, and about seven miles distant from the Mediterranean, from which it is divided by the lagoons of Perols and l'Arnel. The town is of comparatively late formation as towns go in France, having become a place of note only in the eighth century. It is a wine and brandy centre, and is also engaged in silk works, and, owing to its situation, enjoys a congenial climate. The population is upwards of 80,000.