The city of Messana, situated on the straits which divide Sicily from Italy, was occupied at this time by the Mamertini. They were a body of Campanian mercenaries, chiefly of Sabellian origin, who had served under Agathocles, and after the death of that tyrant (B.C. 289) were marched to Messana, in order to be transported to Italy. Being hospitably received within the city, they suddenly rose against the inhabitants, massacred the male population, and made themselves masters of their wives and property. They now took the name of Mamertini, or "Children of Mars," from Mamers, a Sabellian name for that deity. They rapidly extended their power over a considerable portion of the north of Sicily, and were formidable enemies to Syracuse. Hiero, having become king of Syracuse, determined to destroy this nest of robbers, advanced against them with a large army, defeated them in battle, and shut them up within Messana. The Mamertines were obliged to look out for help; one party wished to appeal to the Carthaginians, and the other to invoke the assistance of Rome. The latter ultimately prevailed, and an embassy was sent to implore immediate aid. The temptation was strong, for the occupation of Messana by a Carthaginian garrison might prove dangerous to the tranquillity of Italy. Still the Senate hesitated; for only six years before Hiero had assisted the Romans in punishing the Campanian mercenaries, who had seized Rhegium in the same way as the Mamertines had made themselves masters of Messana. The voice of justice prevailed, and the Senate declined the proposal. But the Consuls, thirsting for glory, called together the popular assembly, who eagerly voted that the Mamertines should be assisted; in other words, that the Carthaginians should not be allowed to obtain possession of Messana. The Consul App. Claudius, the son of the blind Censor, was to lead an army into Sicily. But during this delay the Carthaginian party in Messana had obtained the ascendency, and Hanno, with a Carthaginian garrison, had been admitted into the citadel. Hiero had concluded peace with the Mamertines through the mediation of the Carthaginians, so that there was no longer even a pretext for the interference of the Romans. But a legate of the Consul App. Claudius, having crossed to Sicily, persuaded the Mamertines to expel the Carthaginian garrison. Hiero and the Carthaginians now proceeded to lay siege to Messana by sea and land, and the Romans no longer hesitated to declare war against Carthage. Such was the commencement of the first Punic War (B.C. 264).