He made, however, no attempt upon the sovereignty though his friends were very ready to support him, and even pressed him to the enterprise untl he was encouraged to it by the fortuitous aid of persons unknown to him and at a distance. Two thousand men, drawn out of three legions in the Moesian army, had been sent to the assistance of Otho. While they were upon their march, news came that he had been defeated, and had put an end to his life; notwithstanding which they continued their march as far as Aquileia, pretending that they gave no credit to the report. There, tempted by the opportunity which the disorder of the times afforded them, they ravaged and plundered the country at discretion; until at length, fearing to be called to an account on their return, and punished for it, they resolved upon choosing and creating an emperor. "For they were no ways inferior," they said, "to the army which made Galba emperor, nor to the praetorian troops which had set up Otho, nor the army in Germany, to whom Vitellius owed his elevation." The names of all the consular lieutenants, therefore, being taken into consideration, and one objecting to one, and another to another, for various reasons; at last some of the third legion, which a little before Nero's death had been removed out of Syria into Moesia, extolled Vespasian in high terms; and all the rest assenting, his name was immediately inscribed on their standards. The design was nevertheless quashed for a time, the troops being brought to submit to Vitellius a little longer.

However, the fact becoming known, Tiberius Alexander, governor of Egypt, first obliged the legions under his command to swear obedience to Vespasian as their emperor, on the calends [the 1st] of July, which was observed ever after as the day of his accession to the empire; and upon the fifth of the ides of the same month [the 28th of July], the army in Judaea, where he then was, also swore allegiance to him. What contributed greatly to forward the affair, was a copy of a letter, whether real or counterfeit, which was circulated, and said to have been written by Otho before his decease to Vespasian, recommending to him in the most urgent terms to avenge his death, and entreating him to come to the aid of the commonwealth; as well as a report which was circulated, that Vitellius, after his success against Otho, proposed to change the winter quarters of the legions, and remove those in Germany to a less hazardous station and a warmer climate. Moreover, amongst the governors of provinces, Lucinius Mucianus dropping the grudge arising from a jealousy of which he had hitherto made no secret, promised to join him with the Syrian army, and, among the allied kings, Vologesus, king of the Parthians, offered him a reinforcement of forty thousand archers.