The Histories is a Roman historical chronicle by Tacitus and it covers the Year of Four Emperors following the downfall of Nero in 68 AD, a year in the history of the Roman Empire in which four emperors ruled in succession: Galba, Otho, Vitellius, and Vespasian. The mode of their accession showed that because imperial power was based on the support of the legions, an emperor could now be chosen no...