Following the disastrous Battle of Carrhae, things changed in Rome. In modern day France, Gaius Julius Caesar defeated the last organized Gaulic resistance, and captured Vercingetorix, the so-called “king of all the Gauls.” The wealth that he plundered in Gaul made Caesar the richest Roman citizen, and his power and popularity was greater than almost anyone else in the city. Yet he still had one rival. His former political ally Gnaeus Pompeius Magnus.
During his time as consul that we don’t have to get into, Caesar had committed several crimes against the Senate and people of Rome.