Hi, in Julius Caesar by William Shakespeare, Cassius believes that he must have Brutus as a member of the conspirators. Brutus had a reputation of honesty and persuasive skills that Cassius knew would be needed one the assassination took place. In addition, Brutus was known for his logical, reasoning and strong oratorical skills.
Brutus is concerned about Caesar as a result of Cassius's arguments. He thinks he's ambitious but has not really seen it.
Brutus has decided that Caesar has to die. He has nothing against him personally. His death is necessary for the good of the people.
Republican by nature, Brutus never tried to hide his political convictions. Married to Cato's daughter, his cousin sister Porcia, he wrote a text extolling the qualities of his deceased father-in-law. Cesar was very fond of him and respected his opinions very much. However, Brutus, like many other senators, was not satisfied with the state of the Republic. Cesar had been appointed perpetual dictator and had passed several laws that concentrated power in his hands. It was rumored that only the crown was missing to match any king. The final period of the monarchy in Rome was a bad memory. The Romans had replaced royalty with the Republic and the more traditional did not want a return to such a system. Brutus was finally motivated to join the conspiracy by anonymous letters sent to him in which Rome asked for help. Brutus started a conspiracy against César along with his brother-in-law and friend Gaius Cassius Longinus and other senators. In the Ides of March (March 15, 44 BC), a group of senators, including Brutus, murdered César in the theater of Pompey.
The anonymous letters sent by “Rome” ask for his help ultimately motivates Brutus to join the conspiracy.
Brutus joined the conspiracy against Caesar in order to prevent Rome from the ambitious nature of Caesar in the coming future. While addressing the crowd after the murder of Caesar, Brutus says that he has killed Caesar because of his growing ambition which would be very harmful to the citizens of Rome. He adds that he would never accept that because of one person the whole of the Roman empire would be trapped in the web of slavery.