The fourth book of Tacitus' Annals has been described as 'the best that Tacitus ever wrote'. It covers the years AD 23-28, beginning at the point where Tacitus noted a significant deterioration in the principate of the emperor Tiberius, and the increasingly malign influence of his 'evil genius' Sejanus. In this new edition the editors present an improved text of Annals IV, explain in detail the di...