Julius Caesar was a famous leader of which historical empire?

Caesar was the head of the Roman Republic. Although it might have been an Empire in everything but name, the Republic was never referred to as such until long after Julius Caesar died.

BerryG, Just the next generation I think. His heir Octavian killed off Julius' son by Cleopatra and soon proclaimed himself Caesar Augustus, the first Roman emperor, ruling for over 40 years.

BerryG, yes, and he also made the julian calendar.