In 354 the Romans concluded an alliance with the Samnite peoples of the south central Apennines. Probably this agreement was reached in view of the common fear of Gallic invasions and because both parties were at war with the smaller peoples dwelling between Latium and Campania, so that a delimitation of their respective spheres of action was deemed advisable. At any rate, it was in the course of the next few years that Rome completely subdued the Volsci and Aurunci, while the Samnites overran the land of the Sidicini. *The Latin War, 338–336 B. C.* Not long afterwards, the Latins, allied with the Campanians, were at war with Rome. Even before this, subsequent to the Gallic capture of Rome, the Romans had fought with individual Latin cities, but now practically all the cities of the Latin league were in arms against them. It is possible that both Latins and Campanians felt their independence threatened by the expansion and alliance of the Romans and the Samnites and that this was the underlying cause of hostilities. However that may be, within two years the Latins had been completely subdued. The Latin league ceased to exist. The individual cities, except Tibur and Praeneste, lost their independence and were incorporated in the Roman state. These two cities preserved their autonomy and concluded new treaties with Rome. *Alliance with the Campanians, about 334 B. C.* At about the same time, the majority of the cities of Campania, including Capua, concluded an alliance with Rome upon the conditions of the Roman alliance with the old Latin league. These cities retained their independence, and extended and received the rights of _commercium_ and _connubium_ with Rome. This meant that the citizen of one city could transact any business in another that was party to this agreement with the assurance that his contract would be protected by the law of the second city, while if he married a woman of that city his children would be considered legitimate heirs to his property. By virtue of this close alliance, the military resources of Campania were arrayed on the side of Rome, and Rome and Campania presented a united front against their common foes. The Roman sphere of influence was thus extended as far south as the Bay of Naples. After the Latin war, the territory previously won from the Volsci and Aurunci was largely occupied by settlements of Roman citizens or by Latin colonies, for even after the dissolution of the Latin league the Romans made use of this type of colony to secure their conquests, as well as to relieve the surplus population of Rome and Latium. IV. WARS WITH THE SAMNITES, GAULS AND ETRUSCANS: 325–280 B. C.