Dio’s portrayal of Tiberius has traditionally suffered by comparison with that of Tacitus. Whereas some have attempted to look beyond such comparisons and to interpret Dio’s Tiberius as a component in a broader narrative discourse about the nature of Roman imperial power, questions still remain as to how we should read Dio’s portrayal of this most cryptic of emperors. In this chapter, Mallan looks for the unifying themes of Dio’s pre- and post-accession portrayal of Tiberius, before discussing how this portrayal of Tiberius fits into Dio’s overarching conception of the ciuilis princeps and his ideal of imperial behaviour.