Ides of March

• 1. Introduction

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  The Ides of March carries a weight few calendar dates can match. On the 15th of March, 44 BC, Julius Caesar was stabbed to death on the floor of a Senate meeting, and nothing in the Roman world was ever quite the same. But the Ides of March was not invented for Caesar's murder. It was already ancient, already sacred, already loaded with ceremony long before a group of up to sixty conspirators put knives in their hands. What made this particular day on the Roman calendar so significant? Why did the Romans build so much ritual around a midpoint in the month of March? And what exactly happened in the moments before Caesar walked into that meeting?

• 2. How Romans Counted Time

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  Romans never counted the days of a month the way most of the modern world does. Rather than numbering from the first to the last, they measured time by counting backward from three fixed anchors: the Kalends on the first of the following month, the Nones on either the 5th or 7th, and the Ides on either the 13th or 15th. March, May, July, and October were the months where the Ides fell on the 15th rather than the 13th. Those four months were distinguished in a way that went back to the earliest shape of the Roman year.

  March itself held the position of first month in the Roman year until as late as the mid-second century BC. The numerical names embedded in September, October, November, and December are relics of that original order. September meant the seventh month, October the eighth, November the ninth, and December the tenth. When January and February were inserted before March, the numbering was never corrected. So the Ides of March, under the old reckoning, would have fallen on roughly the first full moon of the new year. The Ides were originally tied to the full moon, reflecting how early the Roman calendar drew on lunar cycles.

  As a fixed point repeated every month, the Ides accumulated practical uses. Debt payments were due on the Ides. Rents came due on the Ides. The day was as much a financial deadline as a religious occasion, which meant Romans of all classes had reason to keep track of it.

• 3. Sacred to Jupiter

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  March was named for the god Mars, and the first of the month marked his birthday with ceremony. But the Ides of every month belonged to a different deity entirely. Jupiter, the Romans' supreme god, claimed the Ides as his sacred day. The Flamen Dialis, who served as Jupiter's high priest, led what the Romans called the "ovis Idulis" - the Ides sheep - in procession along the Via Sacra to the arx, where the animal was sacrificed.

  Even after January and February pushed March out of first place in the calendar, March kept many of its new-year ceremonies. The Ides of March was the occasion of the Feast of Anna Perenna, a goddess whose very name was linked to the Latin word for year, "annus." Her festival was understood to conclude the new-year cycle. The common people celebrated it enthusiastically with picnics, drinking, and general revelry. The Ides of March also hosted the Mamuralia, an obscure ritual known from at least one late-antique source. It involved beating an old man dressed in animal skins and possibly driving him out of the city - an act that scholars read as a pharmakos ritual, the expulsion of a scapegoat figure representing the old year being driven out to make way for the new.

  In the later Imperial period, the 15th of March took on another layer of sacred meaning. It was designated Canna intrat, meaning "The Reed enters," marking the birth of the god Attis, who was found as an infant among the reeds of a Phrygian river. Whether he was discovered by shepherds or by the goddess Cybele - known as the Magna Mater or Great Mother - the sources differ. The Emperor Claudius, who died in 54 AD, formalized this observance as part of the official Roman calendar. A week of mourning that followed the Ides concluded on the 25th of March, the vernal equinox under the Julian calendar, with celebrations of Attis's rebirth.

• 4. The Prophecy and the Joke

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  Plutarch records that a seer had warned Julius Caesar that harm would come to him on the Ides of March. The identity of that seer was later pinned down by the biographer Suetonius, who named him as a haruspex - a diviner who read entrails - called Spurinna. On the morning of the 15th of March, 44 BC, Caesar was on his way to the Theatre of Pompey when he passed Spurinna in the street. Caesar reportedly joked, "Well, the Ides of March are come," implying the prophecy had been wrong. Spurinna replied, "Aye, they are come, but they are not gone."

  William Shakespeare later dramatized this exchange in his play "Julius Caesar," where a soothsayer delivers the warning to "Beware the Ides of March." Shakespeare's version made the phrase immortal in the English-speaking world. But the original encounter, as Plutarch and Suetonius preserved it, was a brief street-side exchange between a confident man and a quietly insistent one. Within hours, Caesar was dead.

• 5. Sixty Conspirators

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  As many as sixty conspirators were involved in the plot to kill Julius Caesar, led by Brutus and Cassius. Caesar was stabbed to death at the Senate meeting held at the Theatre of Pompey. The killing did not achieve the political stability its planners had hoped for. Instead, it opened what Caesar's own death had started: the final crisis of the Roman Republic.

  Caesar's adopted heir, Octavian, eventually emerged from the civil wars that followed. On the fourth anniversary of the assassination - the Ides of March in 40 BC - Octavian had just secured a victory at the siege of Perugia. He marked the occasion by executing 300 senators and equites who had fought against him under Lucius Antonius, the brother of Mark Antony. Both Suetonius and the historian Cassius Dio described these executions in religious terms, noting that they took place on the Ides of March at the new altar to the deified Julius. The killing of Caesar, in other words, had been turned into a sacred date requiring ritual vengeance.

  Ovid, writing under Augustus, cast Caesar's murder as a sacrilege rather than a political act. Caesar had been not only a general and a ruler but also the pontifex maximus of Rome and a priest of Vesta. Killing him on the Ides of March - a day already sacred to Jupiter - layered religious transgression on top of political violence. In 27 BC, Octavian took the name Augustus and became the first emperor. The Republic that Brutus and Cassius claimed they were defending had ceased to exist.

• 6. A Date That Outlasted Rome

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  The phrase "Beware the Ides of March" survived the fall of Rome, the Middle Ages, and the early modern period largely on the strength of Shakespeare's play. But beneath the theatrical warning was a much older structure: a day that had carried the weight of new-year sacrifice, royal debt deadlines, the procession of a sheep along the Via Sacra, the beating of a scapegoat figure, the birth of Attis among Phrygian reeds, and the murder of the most powerful man in the Roman world.

  The Ides of March in 44 BC marked what historians consider a turning point in Roman history, triggering the sequence of civil wars that would end the Republic. But March retained its religious texture long after Caesar's blood had been washed from the Theatre of Pompey. The feast of Anna Perenna, the ovis Idulis, and the Cybele-Attis holy week continued. The Roman world layered meaning upon meaning onto a date that had started as nothing more than the moment of the year's first full moon.