Numa, also, was founder of several other orders of priests, two of which I shall mention, the Salii and the Feciales, which are among the clearest proofs of the devoutness and sanctity of his character. These Fecials, or guardians of peace, seem to have had their name from their office, which was to put a stop to disputes by conference and speech; for it was not allowable to take up arms until they had declared all hopes of accommodation to be at an end, for in Greek, too, we call it peace when disputes are settled by words, and not by force. The Romans commonly dispatched the Fecials, or heralds, to those who had offered them injury, requesting satisfaction; and, in case they refused, they then called the gods to witness, and, with imprecations upon themselves and their country should they be acting unjustly, so declared war; against their will, or without their consent, it was lawful neither for soldier nor king to take up arms; the war was begun with them, and, when they had first handed it over to the commander as a just quarrel, then his business was to deliberate of the manner and ways to carry it on. It is believed that the slaughter and destruction which the Gauls made of the Romans was a judgment on the city for neglect of this religious proceeding; for that when these barbarians besieged the Clusinians, Fabius Ambustus was dispatched to their camp to negotiate peace for the besieged; and, on their returning a rude refusal, Fabius imagined that his office of ambassador was at an end, and, rashly engaging on the side of the Clusinians, challenged the bravest of the enemy to a single combat. It was the fortune of Fabius to kill his adversary, and to take his spoils; but when the Gauls discovered it, they sent a herald to Rome to complain against him; since, before war was declared, he had, against the law of nations, made a breach of the peace. The matter being debated in the senate, the Fecials were of opinion that Fabius ought to be consigned into the hands of the Gauls; but he, being forewarned of their judgment, fled to the people, by whose protection and favor he escaped the sentence. On this, the Gauls marched with their army to Rome, where, having taken the Capitol, they sacked the city. The particulars of all which are fully given in the history of Caminus.