Galba
Plutarch
Plutarch. Plutarch's Lives, Vol. XI. Perrin, Bernadotte, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1926.
While some of the soldiers were already for adopting this proposal and others for rejecting it, one standard-bearer stole away and brought tidings of the matter by night to Vitellius, as he was entertaining many guests. The news spread swiftly to the troops, and first Fabius Valens, commander of a legion, rode up next day with a large body of horsemen and saluted Vitellius as emperor.
Hitherto Vitellius had seemed to decline and avoid the office, fearing the magnitude of it; but on this day, as they say, being fortified with wine and a midday meal, he came out to the soldiers and accepted the title of Germanicus which they conferred upon him, though he rejected that of Caesar.
And straightway the army with Flaccus also, casting aside those fine and democratic oaths of theirs to support the senate, took oath that they would obey the orders of Vitellius the emperor.
Thus was Vitellius proclaimed emperor in Germany; and when Galba learned of the revolution there he no longer deferred his act of adoption. Knowing that some of his friends favoured the selection of Dolabella, and most of them that of Otho, neither of whom was approved by himself, he suddenly, and without any previous notice of his intention, sent for Piso (whose parents, Crassus and Scribonia, had been put to death by Nero),
a young man in whose predisposition to every virtue the traits of gravity and decorum were most conspicuous; then he went down to the camp to declare him Caesar and heir to the throne. And yet as soon as he set out, great signs from heaven accompanied him on his way, and after he had begun to pronounce and read his address to the soldiers, there were many peals of thunder and flashes of lightning, and much darkness and rain pervaded both the camp and the city, so that it was plain that the act of adoption was inauspicious and was not favoured or approved by the heavenly powers.