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

[6] So Nero esteemed these circumstances as favorable omens, and saw that Vespasian's age gave him sure experience, and great skill, and that he had his sons as hostages for his fidelity to himself, and that the flourishing age they were in would make them fit instruments under their father's prudence. Perhaps also there was some interposition of Providence, which was paving the way for Vespasian's being himself emperor afterwards. Upon the whole, he sent this man to take upon him the command of the armies that were in Syria; but this not without great encomiums and flattering compellations, such as necessity required, and such as might mollify him into complaisance. So Vespasian sent his son Titus from Achaia, where he had been with Nero, to Alexandria, to bring back with him from thence the fifth and. the tenth legions, while he himself, when he had passed over the Hellespont, came by land into Syria, where he gathered together the Roman forces, with a considerable number of auxiliaries from the kings in that neighborhood.

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