If you read his own account of his rule (Res Gestae), none.
He gave his wife too much leeway, and she rewarded this with poisoning him.
what weaknessess did cassius see in caesar
Julius Caesar's main weakness was arrogance. The quote "Caesar's wife must be above suspicion" shows his arrogance in his own words.
Caesar was warned not to, however, to not go would appear to be a sign of weakness.
After sarcastically comparing Caesar to the Colossus of Rhodes, showing how Caesar thinks himself superior to the senators, his epilepsy makes him seem less than an average senator, in Cassius' mind.
Cassius has a lot of envy towards Caesar, he wants the power and wont let casar get it! so he manipulates brutus into thinking that Caesar is a tyrant and that hes going to abuse his power. brutus, being an idealist, believes Cassius and assassinates his friend, Caesar.
He managed to stop his epileptic fits becoming common knowledge by having servants cover it up, but couldn't stop them.
These are 4 weaknesses of Caesar: He has seizures (as stated by Cassius). He can't swim (as stated by Cassius). Manipulated too easily (was convinced to go to the capitol, despite the warnings of others). Unyielding in his decisions (the conspirators tried to get Caesar to change his mind on several issues, so that they might consider sparing his life).
The feminist critic would say that the male and female roles that are portrayed in The Tragedy of Julius Caesar show female weakness and absence of control.
It depends on whether you are asking about the Shakespeare play or actual history. In terms of physical weakness, he had epilepsy and was a rather slight man. In the Shakespeare play, he was also deaf in his left ear, and Cassius needed to rescue him from drowning in the Tiber when he was young. You could also say that his arrogance was a significant weakness.
Cassius recalls a windy day when he and Caesar stood on the banks of the Tiber River, and Caesar dared him to swim to adistant point. They raced through the water, but Caesar became weak and asked Cassius to save him. Cassius had to drag him from the water. Cassius also recounts an episode when Caesar had a fever in Spain and experienced a seizure. Cassius marvels to think that a man with such a feeble constitution should now stand at the head of the civilized world.
Cassius states that Caesar is no greater than he or Brutus (by birth), and is indeed a lesser man physically. So he feels it is wrong that he should be the one and only power in Rome, especially a Rome that was a Republic -- and therefore all Roman men share political equality (ideally). He also implies later that Caesar doesn't really like him and that upsets him: he isn't part of Caesar's inner circle.
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