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A uncommon coin strike by Marcus Junius Brutus after he helped assassinateJulius Caesarwill go to vendue next week . The gilt coin — one of only 17 of its kind make out to exist — see to 43 or 42 B.C. and draw Brutus on the front and a prize celebrate a naval victory on the back .

On the Ides of March in 44 B.C. , Brutus and co - plotter Gaius Cassius Longinus led dozens of men to a confluence of the Roman Senate . Their programme was to murder Caesar , as they think his get ability threatened theRoman Republic . Caesar was stabbed 23 times , and as he lay dying , he splendidly chastised his close Quaker Brutus for his role in the plot . ( Although Caesar speak to Brutus in Greek , this interaction was afterward dramatise by William Shakespeare with the Latin phrasal idiom " Et tu , Brute ? " which translates to " Even you , Brutus ? " )

A 1st c BC Roman gold coin with a portrait of Brutus on the front and a trophy and ships on the back, against a white background

A rare ‘Brutus’ aureus minted around 43 B.C. is up for auction in December.

Although many senators and other popish leaders participated in Caesar ’s assassination , the Roman people were outraged by the news . Within months , Brutus and Cassius go into exile , attempting to take over the eastern provinces , while Caesar ’s allies stayed in Rome .

To pay his soldiers , Brutus minted coin such as thesilver denarius , which was deserving about a solar day ’s salary , and the gold aureus , which was equivalent to 25 denarii , or rough a month ’s wage .

The disagreements between the conspirator and allies finally forced a civil war that live on from 43 to 42 B.C. , ending when Caesar ’s allies defeated Brutus and Cassius at the Battle of Philippi in Greece .

The coin hoard, amounting to over $340,000, was possibly hidden by people fleeing political persecution.

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The rare golden coin going up for auction is anaureusthat was struck before the Battle of Philippi and has a portraiture of Brutus on the front .

" The title of respect BRVTVS IMP(erator ) on the obverse refers to the military triumph over the Thracian tribe of the Bessi , who defend Brutus ’s ascendency of the surface area in 43 BCE,“Lucia Carbone , the Andrew M. Burnett Associate Curator of Roman Coins at the American Numismatic Society , told Live Science in an email .

A small gold coin on a black background. The front has a lion and bull; the back has two squares.

The back of the coin includes two conjoined ships ' stem ( the forward - most part of the bow ) , which exemplify Brutus ' and Cassius ' naval victory in 42 B.C. , Carbone aver . Somewhat ironically , " the victories observe on this aureus were the direct crusade of their final defeat in Philippi , " she allege , because they were debase thin by fighting on two front . In accession , the back references Publius Servilius Casca Longus , one of the co - conspirators and possibly the first person to stab Caesar .

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One reason this coin is so rare is that only six revenue stamp die — two for the front and four for the back — were used to create the purpose , which was issued for a very short clock time . The coin also comes from a large and crucial collection of Roman coins owned by the other 20th - 100 Italian politicianGiuseppe Mazzini , Carbone said .

But a 2016 research article in the academic journalThe Numismatic Chroniclequestions whether this particular aureus is authentic . At issue is thedie axis — essentially , the alignment of the front and back dies that stump the design . Of the few Brutus aurei jazz to exist , those with a 12 o’clock axis vertebra — in which the innovation on the front and back are likewise adjust — are imagine to be authentic , while those with a 6 o’clock axis — where the back is upside down proportional to the front — require further examination . The coin up for auction bridge has an axis vertebra just off 6 o’clock .

A corroded bronze sword broken into three parts is reassembled on a long light-colored wooden board. The board is on the snow-covered ground, and a yellow measuring tape is expanded beside the sword.

When reached for comment , Alain Baron , the beginner of the auction house Numismatica Genevensis SA , told Live Science by email that the Brutus aureus " was never question by any of the experts that saw the coin physically . " Further , Baron allege , the coin has been endorse by theNumismatic Guaranty Company(NGC ) and is in a sealed holder . NGC did not at once respond to a unrecorded Science electronic mail by press prison term .

" While coin collectors have long prized coins previously possess by famous collectors or scholarly person , these object histories are even more critical today , in light of growing legal and ethical concerns around collecting,“Liv Yarrow , a Roman historian at the City University of New York , told Live Science in an e-mail .

Carbone and Yarrow decline to offer any opinion on the authenticity of the coin before long at auction .

an aerial view of an old city on a river

This aureus was last sold in 2006 and will be up for auction Dec. 9 - 10 byNumismatica Genevensis SA .

remains of a bed against a wall

a horse skeleton in the ground

The fall of the Roman Empire depicted in this painting from the New York Historical Society.

Mount Vesuvius behind the ruins of pompeii.

A stretch of Hadrian�s Wall at Walton�s Crags in Northumberland, England, coloured by the setting sun.

a mosaic of gladiators fighting animals

an illustration of Mars

three prepackaged sandwiches

Tunnel view of Yosemite National Park.

A scuba diver descends down a deep ocean reef wall into the abyss.

Remains of the Heroon, a small temple built for the burial cluster of Philip II at the Museum of the Royal Tombs inside the Great Tumulus of Aigai (Aegae)

An artist�s illustration of a satellite crashing back to Earth.