In the play Julius Caesar, how does Cassius persuade Brutus to join the conspiracy?

In Julius Caesar, Cassius cleverly persuades Brutus to join the conspiracy by elaborating on Caesar's numerous faults and appealing to Brutus's honor. Cassius challenges Brutus to stand up to Caesar and defend Rome from tyranny like his ancestor. Cassius also manipulates Brutus by sending him fabricated letters from concerned citizens. Cassius's tactics are successful, and Brutus joins the conspirators to assassinate Julius Caesar.

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In persuading Brutus to join the conspiracy against Caesar, Cassius shows himself to be a master manipulator. Like a great psychologist, he understands what makes Brutus tick, what motivates him in life. He knows just what it will take for Brutus to take the fatal step and participate in a deadly plot that will result in the brutal murder of a man who's supposed to be a dear friend.

Cassius is acutely aware that Brutus has an enormous ego. So he plays upon Brutus's self-regard by making it seem that the most prominent citizens of Rome are begging for him to step forward and help bring Caesar's reign to an end.

To this end, he arranges for fabricated letters from concerned citizens to be sent to Brutus's house. Brutus is so convinced of his indispensability to the Roman Republic that he doesn't for one moment suspect anything untoward. This is exactly what he'd expect Caesar's enemies among the great and the good to do. They recognize, as Brutus has always done, that only he can save the Republic from Caesar's growing tyranny.

Cassius also skillfully plays upon the Roman tradition of ancestor worship in order to get Brutus onboard with the assassination plot. Ancient Romans were expected to live up to and indeed exceed the achievements of their ancestors. And Brutus is no different.

One of his ancestors helped to overthrow Lucius Tarquinius Superbus, and Cassius wants Brutus to follow in his illustrious ancestor's footsteps by participating in a plot to overthrow another dangerous tyrant. In doing so, he will be adding to the glory of his family name as well as saving the Roman Republic.

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Cassius persuades Brutus to join the conspiracy by appealing to his honor and convincing him that Julius Caesar is not worthy of ruling Rome. In act 1, scene 2, Cassius approaches Brutus during the Lupercal festivities and gauges his attitude towards Caesar. Once Cassius recognizes that Brutus is vexed by Caesar's popularity and the idea that he might be crowned king, Cassius elaborates on Caesar's negative qualities and portrays him as an unworthy, ordinary individual with numerous faults. Cassius tells a story of the time he saved Caesar from drowning in the Tiber and recalls witnessing Caesar experience an epileptic fit. Cassius tells Brutus,

And this man
Is now become a god, and Cassius is
A wretched creature, and must bend his body
If Caesar carelessly but nod on him.

Cassius goes on to compare Caesar to the Colossus and asks if Romans were meant to walk under his legs to their "dishonorable graves." He then challenges Brutus's integrity by saying,

Men at some time are masters of their fates:
The fault, dear Brutus, is not in our stars,
But in ourselves, that we are underlings.

Cassius also appeals to Brutus's sense of honor by mentioning his famous ancestor who overthrew Lucius Tarquinius Superbus. Essentially, Cassius challenges Brutus to defend Rome from tyranny by joining the conspiracy or risk living the rest of his life as a slave. In addition to portraying Caesar as a typical, unworthy civilian and appealing to Brutus's honor, Cassius also manipulates Brutus by having fabricated letters from concerned citizens sent to his home. Cassius hopes that Brutus will recognize the importance of assassinating Caesar to save the Roman Republic from a potential tyrant.

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Cassius attempts to convince Brutus to join the conspriacy in a couple of ways, though the more effective way is through deception.

First, during the feast of Luprical in the first act, Claudius points out that Caesar is no more worthy of being crowned emporer than Brutus. He points out Caesars many physical weaknesses, such as his girlishness when he is sick or his inability to swim for distances. These weaknesses, however, are not enough to convince Brutus.

Casius knows that Brutus' first concern is for the people of Rome, so to convince him to kill Caesar, Casuis must first convince him that Caesar is bad for Rome. He plants the idea that Caesar is too powerful and that power causes people to be corrupt. He then convinces Brutus that the people themselves fear Caesar and his control.

To do this, Casius forges several letters from anonymous Roman citizens and has them placed around Brutus' home where he is sure to find them. These faked letters convince Brutus that the people would be better served if the threat of an all-powerful Caesar were removed.

For more information about the characters and themes in Julius Caesar, see the links below. I've also included a link to the soliloquy where Brutus decides that he must stop Caesar and why.

He would be crown'd:
How that might change his nature, there's the question.
It is the bright day that brings forth the adder
And that craves wary walking. Crown him? that;
And then, I grant, we put a sting in him
That at his will he may do danger with.

Brutus is saying that though Caesar may be a good man now, too much power may change his nature, and turn him into something dangerous.

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