Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[211] But when Tiberius had given order to Euodus to bring the children to him the next day in the morning, he prayed to his country gods to show him a manifest signal which of those children should come to the government; being very desirous to leave it to his son's son, but still depending upon what God should foreshow concerning them more than upon his own opinion and inclination; so he made this to be the omen, that the government should be left to him who should come to him first the next day. When he had thus resolved within himself, he sent to his grandson's tutor, and ordered him to bring the child to him early in the morning, as supposing that God would permit him to be made emperor. But God proved opposite to his designation; for while Tiberius was thus contriving matters, and as soon as it was at all day, he bid Euodus to call in that child which should be there ready. So he went out, and found Caius before the door, for Tiberius was not yet come, but staid waiting for his breakfast; for Euodus knew nothing of what his lord intended; so he said to Caius, "Thy father calls thee," and then brought him in. As soon as Tiberius saw Caius, and not before, he reflected on the power of God, and how the ability of bestowing the government on whom he would was entirely taken from him; and thence he was not able to establish what he had intended. So he greatly lamented that his power of establishing what he had before contrived was taken from him, and that his grandson Tiberius was not only to lose the Roman empire by his fatality, but his own safety also, because his preservation would now depend upon such as would be more potent than himself, who would think it a thing not to be borne, that a kinsman should live with them, and so his relation would not be able to protect him; but he would be feared and bated by him who had the supreme authority, partly on account of his being next to the empire, and partly on account of his perpetually contriving to get the government, both in order to preserve himself, and to be at the head of affairs also. Now Tiberius had been very much given to astrology, and the calculation of nativities, and had spent his life in the esteem of what predictions had proved true, more than those whose profession it was. Accordingly, when he once saw Galba coming in to him, he said to his most intimate friends, that there came in a man that would one day have the dignity of the Roman empire. So that this Tiberius was more addicted to all such sorts of diviners than any other of the Roman emperors, because he had found them to have told him truth in his own affairs. And indeed he was now in great distress upon this accident that had befallen him, and was very much grieved at the destruction of his son's son, which he foresaw, and complained of himself, that he should have made use of such a method of divination beforehand, while it was in his power to have died without grief by this knowledge of futurity; whereas he was now tormented by his foreknowledge of the misfortune of such as were dearest to him, and must die under that torment. Now although he was disordered at this unexpected revolution of the government to those for whom he did not intend it, he spake thus to Caius, though unwillingly, and against his own inclination: "O child! although Tiberius be nearer related to me than thou art, I, by my own determination, and the conspiring suffrage of the gods, do give and put into thy hand the Roman empire; and I desire thee never to be unmindful when thou comest to it, either of my kindness to thee, who set thee in so high a dignity, or of thy relation to Tiberius. But as thou knowest that I am, together with and after the gods, the procurer of so great happiness to thee; so I desire that thou wilt make me a return for my readiness to assist thee, and wilt take care of Tiberius because of his near relation to thee. Besides which, thou art to know, that while Tiberius is alive, he will be a security to thee, both as to empire and as to thy own preservation; but if he die, that will be but a prelude to thy own misfortunes; for to be alone under the weight of such vast affairs is very dangerous; nor will the gods suffer those actions which are unjustly done, contrary to that law which directs men to act otherwise, to go off unpunished." This was the speech which Tiberius made, which did not persuade Caius to act accordingly, although he promised so to do; but when he was settled in the government, he took off this Tiberius, as was predicted by the other Tiberius; as he was also himself, in no long time afterward, slain by a secret plot laid against him.