I, Claudius was broadcast by the BBC in 1976, produced on a budget that would not cover the catering costs of a modern prestige television production, shot almost entirely on interior sets that made no pretense of representing ancient Rome, and it is the finest dramatization of Roman history ever made. The production design is limited. The performances are not. Robert Graves’s source novels provided a narrative that understood the Julio-Claudian dynasty as a political tragedy of Shakespearean scope, and the BBC production found the cast to realize it.

The Roman legion was not a fixed thing. It evolved over seven centuries from the early Republic’s tribal levies to the late Empire’s frontier garrison forces, changing in size, structure, equipment, and recruitment as the military demands on Rome changed. What remained constant was the underlying principle: an infantry force organized for sustained close-quarters combat, disciplined enough to function as a unit under conditions that destroyed individual cohesion, and administratively sophisticated enough to function as a self-sustaining organization in the field.

Jacques-Louis David painted the Oath of the Horatii in 1784, five years before the French Revolution, and the painting arrived in Paris as a political event rather than simply an aesthetic one. Three Roman brothers swear to their father to fight to the death for Rome against the rival city of Alba Longa, their arms extended toward the swords their father holds, their posture rigid with civic resolution. Behind them, the women of the family — who are connected by marriage to the enemy side — collapse in grief that the oath requires be subordinated to duty. The painting is a lecture on republican virtue delivered at the exact moment when the French intelligentsia was developing the vocabulary of republican revolution, and it was received as such.

On a June morning in 217 BC, the Roman consul Gaius Flaminius led his army of approximately 25,000 men along the northern shore of Lake Trasimene in Etruria, moving through a narrow defile between the lake and the hills, in fog thick enough to prevent the reconnaissance that might have revealed what Hannibal had placed along the surrounding heights. Within three hours, roughly 15,000 Romans were dead, Flaminius himself among them, killed in the confusion before any coherent Roman formation had been established. The survivors fled into the lake and drowned or were captured. It was the largest ambush in ancient military history, executed with a precision that modern military historians still use as a case study in the application of terrain and concealment.

Latin is not a dead language. The claim that it died with Rome is one of the more misleading things said about either Latin or Rome, and correcting it requires understanding what actually happened to the language after the Western Empire’s political structures dissolved in the fifth century. Latin did not die. It evolved, as all living languages do, into forms that its classical speakers would have had difficulty understanding. The languages that evolved from it — Italian, French, Spanish, Portuguese, Romanian, Catalan, Galician, Occitan, and several others — are Latin, in the same sense that modern English is Old English: substantially transformed, but continuous. They did not replace Latin; they are Latin, moving through time.

Lawrence Alma-Tadema painted marble better than anyone who has ever lived. The cool translucence of Pentelic and Carrara stone, the way light passes through alabaster, the specific warmth of Cipollino against the blue of the Mediterranean sky — these qualities are rendered in his canvases with a trompe l’oeil precision that makes the painted marble appear to be the thing itself. This is not a small achievement. It is also a precise description of what his paintings of ancient Rome accomplish and where their limitations lie: extraordinary on the surface, and the surface is the point.

The Romans did not found London because they needed a city there. They founded it because they needed a crossing point on the Thames, and the crossing point became a city because trade and administration followed the military logic that had chosen the site. The settlement that grew up at the first substantial tidal ford on the Thames — approximately where London Bridge stands today — was called Londinium, and within a century of its founding it had become the administrative capital of the Roman province of Britannia and one of the most important commercial cities in the northwestern empire. Britain was at the edge of the known world; Londinium was a world city transplanted to the edge.

Marcus Aurelius wrote the Meditations for himself. This is not an inference — it is evident from the text, which is addressed in the second person to himself, organized not as an argument for public consumption but as a series of private reminders, admonitions, and attempts to hold himself to standards he found difficult to maintain. The work was not intended for publication, and if it had been published by its author rather than preserved by accident, it would probably have been a different book. As it survives, it is the most intimate document of a Roman emperor’s inner life that exists, and one of the most honest accounts of what it is like to try to live according to a moral philosophy while holding enormous power over other people.

On October 28, 312 AD, Constantine defeated Maxentius at the Milvian Bridge north of Rome, ending the civil war between them and establishing Constantine as sole ruler of the Western Empire. The battle itself was not particularly difficult — Maxentius’s forces were pushed back onto the bridge over the Tiber, the bridge collapsed, and Maxentius drowned in the river — but what happened before the battle, or what Constantine subsequently claimed happened before it, transformed the event from a routine imperial civil war into one of the most consequential days in the history of Western civilization.

Mithras had no mythology that anyone has found. The god who attracted devotees across the Roman Empire for three centuries, whose cult spread particularly among soldiers and merchants, whose underground temples — mithraea — have been excavated from Britain to the Euphrates, left no sacred texts, no founding narrative, no theology explained in its own terms. What we know about the Mithraic mysteries we know from the material record, from hostile Christian commentary, and from scholarly inference — a body of evidence that has produced sustained academic disagreement and no consensus on the most basic questions. Where did the cult come from? What did the central image mean? What happened in the ceremonies? The answers remain genuinely uncertain.