The EID MAR Denarius Coin - Beware the Ides of March

Marcus Junius Brutus, Assassin of Caesar EID MAR

Heritage Auctions

One of the most famous coins is the EID MAR denarius issued by Marcus Junius Brutus in 43/42 BC. When Julius Caesar crossed the Rubicon, he threw Rome into more than three years of civil war, eliminating his opponents. In 49 BC, many leading citizens, including some sixty Roman Senators, had come to see Caesar as a power-grabber who wanted to make himself king. This state of affairs was unacceptable for men like Brutus, who wished to retain their beloved Republic.

The Liberators

Brutus, a trusted friend of Caesar's, conspired with a group of his fellow senators to assassinate Caesar. This group of conspirators called themselves the Liberatores or Liberators. They believed that they would liberate the Roman Republic from the threat of tyranny by a monarch if they could remove Julius Caesar from power.

The Assassination of Julius Caesar

In 44 BC, on the 15th day of March, a day is known in the Roman calendar as the Ides of March, Brutus and his co-conspirators struck. Using daggers they had hidden beneath their tunics, they rushed at Caesar in a hail of knife blows, stabbing him at least 30 times. When Caesar realized his good friend Brutus was among his attackers, he asked, "Et tu, Brute?" ("You, too, Brutus?"). Then, as Caesar lay dead on the steps of the portico, Brutus jubilantly shouted, "People of Rome, we are once again free!"

Roman Civil War Continues

Unfortunately for Brutus, the general populace was very fond of Julius Caesar. Marcus Antonius (Marc Antony) took advantage of the breach in leadership and loudly condemned Brutus' actions. As a result, Brutus was forced to flee Rome with his soldiers. After several military encounters, Brutus's forces fell to Mark Antony and Octavian (who later became Caesar Augustus) in 42 BC. Unfortunately, Brutus committed suicide before he could be taken as a prisoner.

The Ancient Roman Denarius - A Soldier's Pay

Roman currency consisted mainly of gold, silver, bronze, and copper. Rome first started minting coins in the third century BC and continued for several hundred years. Over this time, with so many changes in denomination and composition. Rome stretched out its production in tough economic times by thinning out its precious metals with base metals such as copper and zinc. This process was known as debasement. However, Roman currency was widely used throughout Eurasia and northern Africa into the Middle Ages because of its economic power and longevity.

Ancient Roman military commanders like Brutus had to pay their soldiers, and they generally did so with a silver coin called a denarius. They frequently minted their coinage in mint workshops that traveled with the army. They often used these coins as propaganda or to commemorate significant victories. For example, in the case of Brutus issued a series of gold and silver coins commemorating the assassination of Julius Caesar.

Two Daggers and a Liberty Cap - and the Portrait of a King?

Brutus issued the EID MAR silver denarius to remind his soldiers that they fought for the Roman Republic. The coin's reverse bears the images of two daggers, between which is a liberty cap, an ancient symbol of freedom. The inscription reads EID MAR, meaning "Eidibus Martiis" or "the Ides of March." The message was intended to convey that Brutus set the Romans free on the Ides of March.

However, there is a curious inconsistency here: In ancient times, especially in Republican Rome, it wasn't considered seemly to put the portrait of a living person on a coin. Sometimes gods were depicted bearing a marked likeness to the actual ruler, but to boldly place your image on the coins was to risk being seen as a king. Julius Caesar's likeness on his coins helped foment the rebellion against him. Here we have Brutus doing the same thing!

Brutus, Imperator

The obverse of the coin features a portrait of Marcus Brutus. The inscription reads BRVT IMP L PLAET CEST, which means Brutus, Imperator, Lucius Plaetorius Cestianus. Lucius Plaetorius Cestianus was the moneyer who managed the mint workers who produced the coin. The Moneyer's name usually appeared on Roman Republican coinage and was a sort of assay mark, guaranteeing the quality of the metal. Imperator meant, roughly, "honored military commander."

The EID MAR Denarius - Rare and Valuable

In Harlan J. Berk's 100 Greatest Ancient Coins (Second Edition), the EID MAR denarius is listed in the number one slot. Berk notes that the coin is highly desirable because of Caesar's assassination's reverse commemorating. He also notes the obverse with Brutus's portrait gives the coin desirability among collectors. Combine this with the rich history of Brutus' assassination of Julius Caesar, and you have an ancient coin that is most desirable amongst coin collectors.

About eighty specimens of this remarkable coin are estimated to exist in silver, with two known in gold. Silver specimens in extremely fine condition have sold at auction for $120,000, including fees. In addition, lower-grade silver examples occasionally come on the market for around $50,000, making it an expensive proposition to add this historically significant coin to your collection.

A gold EID MAR aureus of Brutus
A gold EID MAR aureus of Brutus


A gold EID MAR aureus of Brutus sold for £3,240,000 ($4,188,393 U.S.) on Oct. 29, 2020, setting a record price for any ancient coin. This particular coin is the only publicly available example of this rare gold ancient coin. The other gold examples are displayed at the British Museum and in the permanent collection of the Deutsche Bundesbank, the central bank of the Federal Republic of Germany.