A senator under the principate
Publius (or Gaius) Cornelius Tacitus belonged to the provincial-equestrian class that the principate had drawn into the senate. He served as praetor under Domitian; he held the consulship in 97 CE under Nerva, the year of the so-called restoration; he was proconsul of Asia around 112–113 under Trajan. His political career was the standard one of a successful senator under the new order. His historical career — beginning around 98 and running through the following two decades — was something else.
The order of the surviving works is unusual: the smaller monographs first (the Agricola, the Germania, the Dialogus de Oratoribus), then the Historiae on the years 69–96 (only the books on 69–70 survive in full), and last the Annales on Tiberius through Nero (Books I–VI and XI–XVI survive substantially; the rest in fragments). The chronology runs backwards from his own lifetime because, as he says in the opening of the Historiae, the ground closer to the present was the harder ground to write on.
What he set out to do
Tacitus is the most analytical of the surviving Roman historians. Where Livy works through cumulative narrative and Sallust through moralising compression, Tacitus works through the patient psychological dissection of what unbounded power does to political character. The opening pages of the Annales — Book I, chapters 1–10 — are the single most uncompromising surviving piece of ancient political analysis. The Augustan settlement, Tacitus argues, did not restore the Republic; it preserved its forms while draining their substance. The older generation had seen too much civil war to refuse a settlement that promised peace; the younger had been born after the wars and knew no other Rome. The form of the Republic remained; the political life it was the form of was gone.
The analysis that follows is unsparing. The senate continues to meet; its deliberations no longer matter. The consuls are still elected; the elections no longer constrain anyone. The citizens continue to be citizens; the citizenship no longer implies participation. Tacitus writes from inside this regime — he was a successful operator of it — and the work is therefore not a Republican manifesto. It is the diagnosis of a senator who could see what the regime he had succeeded under had done to political life as such.
What method he developed
The Tacitean style is famous and unmistakable. The Latin is dense, clipped, asymmetric; sentences are weighted toward their endings; the diction is severe and frequently sardonic. The compression is deliberate — the reader is forced to follow analytical work that Tacitus has done in advance and refuses to soften.
The narrative method is psychological. Where Polybius asks for the constitutional explanation and Sallust for the moral one, Tacitus asks for the characterological explanation — what the principate did to the persons inside it, both the rulers and the ruled. The extended portraits of Tiberius and Sejanus in the Annales, of Nero and his court, of the legions of 69 in the Historiae — these are not biography. They are studies in the deformation of political character under conditions where political character has become dangerous to display.
What kind of civilization he described
Tacitus describes a civilization that has preserved its institutional vocabulary while losing the political life that vocabulary once described. Magistrates exist, but command no one. Senate debates occur, but decide nothing. The army keeps the empire's borders, but its discipline depends on the personal authority of one man and falls into civil war when that authority falters. Provincial administration is more competent than the late Republic's had been; military operations are conducted with more system; the Mediterranean economy benefits from peace; and yet the political life of the citizen body has been hollowed out so thoroughly that Tacitus can describe it, in passing, as theatre. The achievement is real and the cost is real. The Tacitean reading is what holds the two together without flinching from either.
What later civilizations took from him
The European tradition has not stopped reading Tacitus. The medieval world had him in fragments; the Renaissance recovered him with particular intensity. The political readers of the sixteenth and seventeenth centuries — Justus Lipsius's neo-Stoic Tacitism, the French politiques, the writers around the English commonwealth — made him the central ancient source on the working of monarchical and absolutist power. Montesquieu cites him. The American founders read him explicitly as the warning case: Jefferson called him "the first writer in the world without a single exception"; John Adams's correspondence is full of him. The conviction that constitutional forms can outlive the political substance they were written for, and that doing so deforms the citizens who live under them, runs from Tacitus into the European republican tradition's standing self-criticism.
Why the platform reads him
The platform reads Tacitus because the question he posed is the sharpest the European tradition received from antiquity: what happens to political life when the institutions of self-government continue to function as forms after their substance has been removed? The question is not safely behind us. Whether the form of a constitution can be preserved while its substance is allowed to drain is a recurring temptation of every long-running political order; Tacitus gives us the most lucid description we have of what it looks like when the temptation has been accepted. The reading is uncomfortable on purpose. That is what the work is for.