Those Roman emperors were a funny lot: Nero with his lyre, Caligula with his speedy horse; Elagabalus with his whoopee cushion (what japes he played on guests who came to dinner!). Mary Beard’s new book spills the tea on all the well-known eccentric autocrats who ruled the Roman world. And what a bunch of oddities they were. Hard to believe that they could have wielded so much power so effectively for so long. Yet Beard’s book is not really about the tittle-tattle. It is, above all, about the idea of Rome’s emperor: that fictitious, hypocritical, and probably accidental conceit by which Octavian/Augustus contrived to be something other than a conventional king. Beard’s answer to the apparent paradox of so many weird mediocrities wielding supreme power is that Roman autocracy was, from its first moment, an act, even a sham. ‘One-man rule’ required a huge supporting, and colluding, cast – from wives and mothers to senators, slaves, and freedmen. Beard explains how the pretence was kept up during its supposedly golden phase: from Actium in 27 bce to Alexander Severus’s murder in 235 ce. Fans of ancient history will certainly enjoy her prose.