M. Reinach, as we have seen, thinks that the Celts had no images, because these were prohibited by their priests. This prohibition was pre-Celtic in Gaul, since there are no Neolithic images, though there are great megalithic structures, suggesting the existence of a great religious aristocracy. This aristocracy imposed itself on the Celts.[1010] We have seen that there is no reason for believing that the Celts had no images, hence this argument is valueless. M. Reinach then argues that the Celts accepted Druidism _en bloc_, as the Romans accepted Oriental cults and the Greeks the native Pelasgic cults. But neither Romans nor Greeks abandoned their own faith. Were the Celts a people without priests and without religion? We know that they must have accepted many local cults, but that they adopted the whole aboriginal faith and its priests _en bloc_ is not credible. M. Reinach also holds that when the Celts appear in history Druidism was in its decline; the Celt, or at least the military caste among the Celts, was reasserting itself. But the Druids do not appear as a declining body in the pages of Cæsar, and their power was still supreme, to judge by the hostility of the Roman Government to them. If the military caste rebelled against them, this does not prove that they were a foreign body. Such a strife is seen wherever priest and soldier form separate castes, each desiring to rule, as in Egypt. Other writers argue that we do not find Druids existing in the Danube region, in Cisalpine territory, nor in Transalpine Gaul, "outside the limits of the region occupied by the Celtæ."[1011] This could only have weight if any of the classical writers had composed a formal treatise on the Druids, showing exactly the regions where they existed. They merely describe Druidism as a general Celtic institution, or as they knew it in Gaul or Britain, and few of them have any personal knowledge of it. There is no reason to believe that Druids did not exist wherever there were Celts. The Druids and Semnotheoi of the Celts and Galatæ referred to _c._ 200 B.C. were apparently priests of other Celts than those of Gaul, and Celtic groups of Cisalpine Gaul had priests, though these are not formally styled Druids.[1012] The argument _ex silentio_ is here of little value, since the references to the Druids are so brief, and it tells equally against their non-Celtic origin, since we do not hear of Druids in Aquitania, a non-Celtic region.[1013]