On March 15, 44 B.C. a group of Roman senators murdered Julius Caesar as he sat on the podium at a senate meeting. The dictator fell bleeding to his death from 23 stab wounds before the horrified eyes of the rest of the house. It was a little after noon on the Ides of March, as the Romans called the mid-day of the month. The spectators didn't know it yet but they were witnessing the last hours of the Roman Republic. But who was to blame?
As readers of William Shakespeare know, a dying Caesar turned to one of the assassins and condemned him with his last breath. It was Caesar's friend, Marcus Junius Brutus.
"Et tu, Brute?" - "You too, Brutus?" is what Shakespeare has Caesar say in the Tragedy of Julius Caesar. Except, Caesar never said these words. And Brutus was neither his closest friend nor his biggest betrayer, not by a long shot.
The worst traitor was another man: Decimus Junius Brutus Albinus. Decimus was a distant cousin of Marcus Brutus. Because Shakespeare all but leaves him out of the story, Decimus is the forgotten assassin. In fact, he was essential.
Shakespeare puts two men in charge of the plot to kill Caesar, Brutus and Gaius Cassius Longinus (he of the famous "lean and hungry look"). Shakespeare mentions Decimus but misspells his name as Decius and downplays his role. But often-overlooked ancient sources make clear that Decimus was a leader of the conspiracy.

Decimus belonged to the Roman nobility, the narrow elite that ruled both Rome and an empire of tens of millions of people. His grandfather extended Rome's rule to the Atlantic, in Spain. But Decimus's father had a mediocre career and his mother dabbled in revolution. Then Caesar came along and offered Decimus the chance to restore his house's name.
Decimus was a soldier at heart, educated but rough and ambitious, as his surviving correspondence shows. "My soldiers have experienced my generosity and my courage," Decimus wrote. "I waged war against the most warlike peoples, captured many strongholds and destroyed many places." He did all that, he wrote, to impress his men, to serve the public, and to advance his reputation.
Decimus warmed to Caesar, a great commander and a war hero to boot. In his mid-twenties Decimus joined Caesar's forces that were fighting to add Gaul (roughly, France and Belgium) to Rome's empire. Decimus won an important naval battle off Brittany and served with Caesar in the siege at Alesia (in today's Burgundy) that sealed Rome's victory in Gaul.

Many Romans feared the power that Caesar amassed. In theory, Rome was a constitutional republic. In practice, Rome teetered for decades on the brink of military dictatorship. Now, Caesar was Rome's first dictator for life — a king in all but name. He even took a queen as his mistress, Cleopatra of Egypt. In March 44 B.C. she lived in Caesar's villa on the outskirts of Rome. Her young son was, she claimed, Caesar's illegitimate child. All of this was too much for Roman traditionalists.
But ambition rather than political principle turned Decimus against Caesar. Decimus's letters suggest a man who cared more about honor than about liberty. He wanted the distinction of a triumph or formal victory parade in Rome, but Caesar denied it, although he granted the privilege to lesser generals. No doubt the dictator liked to dole out his favors slowly to keep his men on their toes. He rewarded Decimus in other ways, but the slight still smarted.
As a past master at ambush, Cassius might have come up with the plan to surprise Caesar in the Senate. Decimus, however, made the wheels turn. Of all the conspirators only he had Caesar's trust. Caesar even had Decimus at his side at a dinner party the night before his assassination. On the morning of the Ides Caesar suddenly decided not to go to the senate meeting, probably because of rumors of conspiracy.
It's not quite true that a soothsayer warned Caesar to "Beware the Ides of March!" as Shakespeare says. In fact, the soothsayer warned Caesar a month earlier to beware a 30-day period ending in the Ides of March, that is, the times from February 15 to March 15. But the Ides had finally come.
When they heard about Caesar's staying home, the plotters sent Decimus to Caesar's house to talk him into attending the senate meeting after all. Decimus did his job. He changed the dictator's mind and Caesar went to the meeting — where he was then murdered.
Afterwards, Decimus provided security to the killers. He owned a troupe of gladiators who doubled as a private police force. They escorted the assassins to safety on the Capitoline Hill and guarded the perimeter during the tense days that followed.
If Decimus was so important to Caesar's assassination why isn't he better known? In part because Brutus monopolized favorable publicity. His friends and family polished his image in publications after his death. Later Romans looked back on Brutus with admiration and laid the groundwork for Shakespeare's eulogy of Brutus as "the noblest Roman of them all."
Not so Decimus. Unlike Brutus, Decimus was no wordsmith, nor did he have admirers with a literary flair to tell his story. Yet his role does appear in certain lesser-known ancient accounts. Although Shakespeare made little use of them they survive today. And so the record allows us to recover the tale of Caesar's forgotten assassin.






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