I don't get why people give Julius Caesar so much credit. The Roman Constitution killed the Republic, not Julius. In the end, Julius ran around killing foreigners, then returned to briefly become dictator before being assassinated.
Augustus Caesar, on the other hand, was an amazing man. Without being seen as a dictator, he took on semi-dictatorial power, and he rewrote the Constitution in such a way as to preserve the nation for either 500 or 1500 years, depending on how you measure it. All this, after winning a three-way civil war without alienating a province enough to cause it to permanently secede.