Many of those who took part in the assassination of Caesar were formerly ardent supporters of Pompey and had fought with him at Pharsalus.<ref> Jiménez, Ramon L. <i>Caesar Against Rome: The Great Roman Civil War</i> (New York, Praeger, 2006), p. 117</ref> However, the fear of emperor was so powerful that overwhelmed than gratitude or even personal affection for Caesar. Cassius the prime mover of the conspiracy was able to present the assassination of the victor of Pharsalus as tyrannicide, the killing of a tyrant. This persuaded many including Brutus to join the plot as they saw it as their duty as Romans. However, the evidence that Caesar wanted a return to the monarchy is scanty and inconclusive. Whatever his intentions, it is clear that the conspirators believed that he was determined to rule as king.<ref> Holland, Tom, <i>Rubicon: The Last Years of the Roman Republic</i> (London, Anchor Books, 2003), p 189</ref>
Breakdown in relations with the Senate====
While the apparent pretensions of Caesar angered many of the conspirators, others were angered over his apparent lack of respect for Roman senators. Several of the conspirators were linked to senators, and the plotters believed that they were acting in the name of the Senate. Senators were technically the lawmakers and the ultimate source of authority in the Republic.<ref>Holland, p. 197</ref> However, Caesar treated that body in a high-handed manner and often with contempt. He did not act in a respectful manner towards the Senate, and this alienated many of them.