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

[616] Justly, therefore, did Vespasian desire to obtain that government, in order to corroborate his attempts upon the whole empire; so he immediately sent to Tiberius Alexander, who was then governor of Egypt and of Alexandria, and informed him what the army had put upon him, and how he, being forced to accept of the burden of the government, was desirous to have him for his confederate and supporter. Now as soon as ever Alexander had read this letter, he readily obliged the legions and the multitude to take the oath of fidelity to Vespasian, both which willingly complied with him, as already acquainted with the courage of the man, from that his conduct in their neighborhood. Accordingly Vespasian, looking upon himself as already intrusted with the government, got all things ready for his journey [to Rome]. Now fame carried this news abroad more suddenly than one could have thought, that he was emperor over the east, upon which every city kept festivals, and celebrated sacrifices and oblations for such good news; the legions also that were in Mysia and Pannonia, who had been in commotion a little before, on account of this insolent attempt of Vitellius, were very glad to take the oath of fidelity to Vespasian, upon his coming to the empire. Vespasian then removed from Cesarea to Berytus, where many embassages came to him from Syria, and many from other provinces, bringing with them from every city crowns, and the congratulations of the people. Mucianus came also, who was the president of the province, and told him with what alacrity the people [received the news of his advancement], and how the people of every city had taken the oath of fidelity to him.