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

[Tenebrous]

The civil war that took place when Caesar was in his late teens ended up with Sulla as dictator. He fought the war against Marius (of Marian reforms fame).

Edit: Just thought I would add, there is no consensus if Caesar ever meant to set up a permanent dictatorship along the lines of Augustus so calling it an attempt to become Emperor is misleading. He was simply a dictator, which had happened several times in Romes history, and may have eventually relinquished power.