At least we can distinguish the principal phases of the religious movement which caused imperial society to pass from incredulity to certain forms of belief in immortality, forms at first somewhat crude but afterwards loftier, and we can see where this movement led. The change was a capital one and transformed for the ancients the whole conception of life. The axis about which morality revolved had to be shifted when ethics no longer sought, as in earlier Greek philosophy, to realise the sovereign good on this earth but looked for it after death. Thenceforth the activity of man aimed less at tangible realities, ensuring well-being to the family or the city or the state, and more at attaining to the fulfilment of ideal hopes in a supernatural world. Our sojourn here below was conceived as a preparation for another existence, as a transitory trial which was to result in infinite felicity or suffering. Thus the table of ethical values was turned upside down. “All our actions and all our thoughts,” says Pascal, “must follow so different a course if there are eternal possessions for which we may hope than if there are not, that it is impossible to take any directed and well-judged step except by regulating it in view of this point which ought to be our ultimate goal.”[2] We will attempt first to sketch in a general introduction the historical transformation which belief in the future life underwent between the Republican period and the fall of paganism. Then, in three lectures, we will examine more closely the various conceptions of the abode of the dead held under the Roman Empire, study in three others the conditions or the means which enable men to attain to immortality and in the last two set forth the lot of souls in the Beyond. * * * * * The cinerary vases of the prehistoric period are often modelled in the shape of huts: throughout, funeral sculpture follows the tradition that the tomb should reproduce the dwelling, and until the end of antiquity it was designated, in the West as in the East, as the “eternal house” of him who rested in it.