Aside from Caesar's attempt to become Emperor...

[Kevin]

Was there any other examples of such a man (or woman) gaining enough power to attempt overthrowing a Senate or Confederation in order to replace it with an autocratic form of government? I am preparing for a debate in my Government/Politics class where I play a role of an anti-federalist denouncing the role of Presidency. I thought Caesar's attempt to become emperor was a perfect example of the people forgetting the role of the Senate and wishing to crown a man as their emperor. There has to be another example of such events occurring throughout history and was wondering if this forum knew of any?

Thanks