The figures that are most frequent upon the sepulchral slabs are, however, not such as bear relation to a name or profession, but the commonly adopted symbols of the faith, similar in design and character to those exhibited in the paintings of the catacombs. The Good Shepherd is thus often rudely represented; the figure of Jonah is naturally, from its reference to the Resurrection, also frequently found; and the figure of a man or woman with arms outstretched, in the attitude of prayer, occurs on many of the sepulchral slabs. The anchor, the palm, the crown, and the dove, as being simpler in character and more easily represented, are still more frequently found. The varying use of symbols at different periods has been one of the means which have assisted in determining approximate dates for the inscriptions upon which they are met with. It is a matter of importance, in many instances, to fix a date to an inscription. Historical and theological controversies hang on such trifles. Most of the early gravestones bear no date; and it was not till the fourth century, that, with many other changes, the custom of carving a date upon them became general. The century to which an inscription belongs may generally be determined with some confidence, either by the style of expression and the nature of the language, or by the engraved character, or some other external indications. Among these latter are the symbols. It has, for instance, been recently satisfactorily proved by the Cavaliere de Rossi that the use of the emblem of the fish in the catacombs extended only to the fourth century, so that the monuments upon which it is found may, with scarcely an exception, be referred to the preceding period. As this emblem went out of use, owing perhaps to the fact that the Christians were no longer forced to seek concealment for their name and profession, the famous monogram of Christ, [Symbol] the hieroglyphic, not only of his name, but of his cross, succeeded to it, and came, indeed, into far more general use than that which the fish had ever attained. The monogram is hardly to be found before the time of Constantine, and, as it is very frequently met with in the inscriptions from the catacombs, it affords an easy means, in the absence of a more specific date, for determining a period earlier than which any special inscription bearing it cannot have originated. Its use spread rapidly during the fourth century. It "became," says Gibbon, with one of his amusing sneers, "extremely fashionable in the Christian world." The story of the vision of Constantine was connected with it, and the Labarum displayed its form in the front of the imperial army. It was thus not merely the emblem of Christ, but that also of the conversion of the Emperor and of the fatal victory of the Church.

It is a remarkable fact, and one which none of the recent Romanist authorities attempt to controvert, that the undoubted earlier inscriptions afford no evidence of any of the peculiar doctrines of the Roman Church. There is no reference to the doctrine of the Trinity to be found among them; nothing is to be derived from them in support of the worship of the Virgin; her name even is not met with on any monument of the first three centuries; and none of the inscriptions of this period give any sign of the prevalence of the worship of saints. There is no support of the claim of the Roman Church to supremacy, and no reference to the claim of the Popes to be the Vicars of Christ. As the third century advances to its close, we find the simple and crude beginning of that change in Christian faith which developed afterward into the broad idea of the intercessory power of the saints. Among the earlier inscriptions prayers to God or to Christ are sometimes met with, generally in short exclamatory expressions concerning the dead. Thus we find at first such words as these:—

AMERIMNVS RVFINAE COIV GI CARISSIME BENEMEREN TI SPIRITVM TVVM DEVS REFRIGERET

Amerimnus to his dearest wife Rufina well-
deserving. May God refresh thy spirit!

And, in still further development,—

[Greek: AUR. AIANOS PAPHLAGON THEOU
DOULOS PISTOS
EKOIMNON EN EIPNIN MINSON
AUTOU
O THEOS EIS TOUS AIONAS]

Aurelius Aelianus, a Paphlagonian, faithful servant of God. He sleeps in peace. Remember him, O God, forever!

Again, two sons ask for their mother,—

DOMINE NE QVANDO ADVMBRETVR SPIRITVS VENERES

O Lord, let not the spirit of Venus be shadowed
at any time!