Brutus was a senator during the ancient Roman times when Julius Caesar was in power. His full name was Quintus Servilius Caepio Brutus. Brutus was a man who was respected by the citizens and understood that Caesar was out of control with his power. Many of the other senators looked up to Brutus and so did Julius Caesar since he was his best friend. However, that all changed when the citizens realized that he had become a murderer.
They may not have liked Caesar but they did not want anyone in politics and in leadership of Rome to be a murderer. After that, things changed for Brutus. He fought in several battles and ended up committing suicide as a result.
Brutus was the noblest of the Romans even after he killed Caesar. Because Brutus killed Caesar for the good of the republic, it was perceived that Brutus's participation in Caesar's assassination was considered honorable. He resisted Caesar's advances, and he asks what sort of dangerous path he is being led down. Brutus has a definite sense of conscience and justice. He also has a good sense of personal responsibility.
Brutus took his own life out of self-condemnation over Caesar, and since he had been defeated, suicide was the honorable way for a Roman to die. Once he realized he was not the better ruler, he removed himself from power.