Tacitus' portrayal of the emperor Tiberius has called forth a superabundance of comment. This note, therefore, will be brief and directed to a single question, provoked by some of this recent work; namely, how far are we entitled to draw conclusions as to Tacitus' powers of psychological analysis or as to his philosophical outlook on the basis of this portrayal? A generation ago Marsh concluded that Tacitus' psychology was superficial: ‘That a man could successfully conceal his real character till he (...) was nearing seventy and then throw off the disguise did not seem to Tacitus in any way improbable.’ Arruntius, he concluded, must be regarded ‘a better psychologist than Tacitus’ in view of his different judgement of Tiberius as recorded by the latter. (shrink)