Widely regarded as ancient Rome’s greatest historian, Tacitus has shaped much of early modern and modern thought on Rome and its emperors. Substantial portions of his major historical works Histories and Annals, however, have not survived, depriving us of his account of crucial episodes and developments in Rome’s early imperial history. This first-of-its-kind volume seeks to fill those gaps, using a range of historical and linguistic approaches to reconstruct the missing portions of Tacitus’ work. The volume offers reconstructions of the fragmentary Tacitean emperors (Augustus, Caligula, Nero, Vespasian, Titus, and Domitian) and of important lost episodes such as the destruction of the Temple of Jerusalem and the eruption of Mt. Vesuvius. By using the concept of incompleteness as a narrative tool, Tacitus and the Incomplete provides novel insights into what Tacitus’ oeuvre might have been like if the lost books had survived, and also expands on recent work on counterfactual historiography, the influence of hindsight on historical writing, the use of prolepsis and other narrative techniques, and on the limitations of historiography in the imperial period.