and Caesar's relationship was already pretty strained by the time
Julius became consul (the highest office in Rome). He was forced to choose between a parade in his honour and running for consul, because Cato filibustered the senate so he couldn't do both.
time in the senate was marked by a large amount of legislation used
to provide land and wealth to the poor, Cato attempted to block most
of these acts as he viewed them as politically motivated and an
attempt to curry favour amongst the people.
took any opportunity he could to talk about how Caesar was plotting
to take over and destroy the republic; and he was kind of right.
Caesar marched his troops across the Rubicon, eyes fell on Cato who
promptly informed the men who had ignored his warnings: 'called it' (or
something to that effect).
46 BC Cato, in Africa, his troops destroyed from the drawn out Roman
Civil War and without hope of defeating Caesar, was offered a pardon
by the new tyrant (at the time, the word had fewer terrible
than admitting Caesar's claim as the one true leader of Rome, Cato
committed suicide via a dagger to the stomach. Caesar would
eventually get his by means of a dagger too... or several daggers