- Political disagreement: Brutus and Cassius were both members of the Roman Senate and believed that Caesar was becoming too powerful and authoritarian. They feared that he would eventually become a tyrant and destroy the Roman Republic, which valued traditional Roman values and institutions.
- Preservation of the Republic: Brutus and Cassius were both strong supporters of the Roman Republic and believed that it was their duty to protect it from Caesar's growing influence and ambitions. They believed that the only way to preserve the Republic was to eliminate Caesar.
- Personal motives: Cassius had some personal grievances against Caesar. He felt that Caesar had not rewarded him enough for his loyalty and support in the past. Brutus, on the other hand, was persuaded by Cassius' arguments and ultimately decided to join the conspiracy against Caesar.
It's important to note that there were many other factors that contributed to Caesar's assassination, such as the wider political climate and the ambitions of other individuals involved in the conspiracy. The motivations mentioned above were just some of the key reasons why Marcus Brutus and Gaius Cassius chose to take part in the assassination of Julius Caesar.