It is necessary to dwell upon such considerations as these, if we would understand the legislation of the Pagan Empire or the changes that were effected by Christianity. The legislators of the Empire distinctly recognised these connections, and made it a main object to authorise, dignify, and regulate them. The unlimited licence of divorce practically included them under the name of marriage, while that name sheltered them from stigma, and prevented many of the gravest evils of unauthorised unions. The word concubine also, which in the Republic had the same signification as among ourselves, represented in the Empire a strictly legal union—an innovation which was chiefly due to Augustus, and was doubtless intended as part of the legislation against celibacy, and also, it may be, as a corrective of the licentious habits that were general. This union was in essentials merely a form of marriage, for he who, having a concubine, took to himself either a wife or another concubine, was legally guilty of adultery. Like the commonest form of marriage, it was consummated without any ceremony, and was dissoluble at will. Its peculiarities were that it was contracted between men of patrician rank and freedwomen, who were forbidden by law to intermarry; that the concubine, though her position was perfectly recognised and honourable, did not share the rank of her partner, that she brought no dowry, and that her children followed her rank, and were excluded from the rank and the inheritance of their father.(761) Against these notions Christianity declared a direct and implacable warfare, which was imperfectly reflected in the civil legislation, but appeared unequivocally in the writings of the Fathers, and in most of the decrees of the Councils.(762) It taught, as a religious dogma, invariable, inflexible, and independent of all utilitarian calculations, that all forms of intercourse of the sexes, other than lifelong unions, were criminal. By teaching men to regard this doctrine as axiomatic, and therefore inflicting severe social penalties and deep degradation on transient connections, it has profoundly modified even their utilitarian aspect, and has rendered them in most countries furtive and disguised. There is probably no other branch of ethics which has been so largely determined by special dogmatic theology, and there is none which would be so deeply affected by its decay.