After parting from Vespasian, Apollonius undertook an expedition into AEthiopia, where he held discussions with the Gymnosophists, and visited the cataracts of the Nile.[307] On his return he received the news of the destruction of Jerusalem; and being pleased with the modesty of the conqueror, wrote to him in commendation of it. Titus is said to have invited him to Argos in Cilicia, for the sake of his advice on various subjects, and obtained from him a promise that at some future time he would visit him at Rome.[308] On the succession of Domitian, he became once more engaged in the political commotions of the day, exerting himself to excite the countries of Asia Minor against the Emperor.[309] These proceedings at length occasioned an order from the Government to bring him to Rome, which, however, according to his biographer's account, he anticipated by voluntarily surrendering himself, under the idea that by his prompt appearance he might remove the Emperor's jealousy, and save Nerva and others whose political interests he had been promoting. On arriving at Rome he was brought before Domitian; and when, very inconsistently with his wish to shield his friends from suspicion, he launched out into praise of Nerva, he was forced away into prison to the company of the worst criminals, his hair and beard were cut short, and his limbs loaded with chains. After some days he was brought to trial; the charges against him being the singularity of his dress and appearance, his being called a god, his foretelling a pestilence at Ephesus, and his sacrificing a child with Nerva for the purpose of augury.[310] Philostratus supplies us with an ample defence, which, it seems, he was to have delivered,[311] had he not in the course of the proceedings suddenly vanished from the Court, and transported himself to Puteoli, whither he had before sent on Damis. This is the only miraculous occurrence which forces itself into the history as a component part of the narrative; the rest being of easy omission without any detriment to its entireness.[312] And strictly speaking, even here, it is only his vanishing which is of a miraculous nature, and his vanishing is not really necessary for the continuity of events. His "liberation" and "transportation" are sufficient for that continuity; and to be set free from prison and sent out of Rome are occurrences which might happen without a divine interposition. And in fact they seem very clearly to have taken place in the regular course of business. Philostratus allows that just before the philosopher's pretended disappearance, Domitian had publicly acquitted him, and that after the miracle he proceeded to hear the cause next in order, as if nothing had happened;[313] and tells us, moreover, that Apollonius on his return to Greece gave out that he had pleaded his own cause and so escaped, no allusion being made to a miraculous preservation.[314]