Let us consider that this foreign dynasty must have brought a new population to the city on the Tiber, the chief strategic point of middle Italy,--a new element of plebs, whatever the old one may have been.[542] We have seen signs, even in the religious history of this age, that commerce and industry were increasing, and that their increase was due to a movement from without, rather than to the old patrician _gentes_. When the Etruscan dynasty fell and the old patrician influence was restored, the government must have been face to face with new difficulties, and among them the supply of corn for an increasing population in years of bad harvest. With a fresh source of supply from the south came the cult of the Greek corn-deities at the bidding of a Sibylline utterance; and henceforward that remedy was available for other troubles. But the patrician rulers of Rome were true, it would seem, as far as was possible, to the old ways, and for a long time they used this foreign remedy very sparingly. At what date the utterances were collected in "books" and deposited in the Capitoline temple we do not know, nor have we any certain knowledge of their original nature or form. Tradition said that the collection dated from the last king's reign, and that it was placed in the care of _duoviri sacris faciundis_, as we have seen, who in 367 B.C. gave way to _decemviri_, five of whom might be members of the plebs. I am myself inclined to conjecture that this comparatively late date may be the real date of the origin of a _permanent collection_ and a _permanent college of keepers_, and that the earlier _duoviri_ were only temporary religious officers, _sacris faciundis_, _i.e._ for the carrying out of the directions of Sibylline utterances specially sought for at Cumae. They would thus be of the same class as other special commissions appointed by the Senate for administrative purposes;[543] while the decemviri, though retaining the old title, were permanent religious officers appointed to collect and take charge of a new and important set of regulations for the benefit of the community, and one which concerned the plebs at least as much as the patricians. But I must turn to the more important question how far, down to the war with Hannibal, when I shall take up the subject afresh, the Roman religion was affected for good or harm by these utterances and their keepers. They took effect in two ways: either by introducing new deities and settling them in new temples, or by ordering and organising new ceremonies such as Rome had never seen before.