The ancients had not arrived at our modern accuracy of definition with regard to the divine and the human, the natural and the supernatural; even the most enlightened contemporary of Augustus might hold a faith as to mixed marriages between gods and men not dissimilar to that held by many orthodox Protestants as to miracles--they might believe that such things did not happen in their own day, but that they had happened. In the curious classification of events affecting the lives of the Emperors adopted by Suetonius a place is always assigned for portents. Xiphilinus, the Christian who epitomized Dio Cassius, apologises for the long lists of portents in his author, and for having cut out the more trivial of these occurrences, but he leaves a large number. Faith in portents is in fact always at hand, and even in these critical days readily springs to life at a favourable opportunity. With the ancients it was universal; in those days, as in our own, men preferred sensation to evidence, and the critical faculty, even when developed, had no very satisfactory apparatus which could be applied. As a rule, the significance of portents was seen after the event which they portended. Then, as now, nurses and mothers recalled remarkable circumstances which had attended the birth and education of children who afterwards became distinguished; and there are few men distinguished or obscure who have not at some period of their lives encountered strange coincidences, or suffered unusual experiences, which, interpreted by the light of subsequent events, may be held to have been fraught with mystery. There is no reasonable doubt that the entrance of Octavian into Rome when he returned to claim his uncle’s inheritance was attended by some unusual disposition of the sun’s rays, possibly a solar halo in which only one of the mock suns was clearly visible, that the event attracted notice at the time, and that it inclined men to believe that the fortunate youth was reserved for a remarkable destiny--an anticipation which led to its own fulfilment. Virgil may well have been in earnest when he hailed the procession of the star of Cæsar and worked up convenient fragments of legends into the _Æneid_; even if he had occasional misgivings, his inclination was to believe, and to hope that his glorious web was woven in threads of fact.