Final answer:
Augustus Caesar is considered Rome's greatest emperor. He rose to power after Julius Caesar's assassination and established the Roman Empire.
Step-by-step explanation:
Augustus Caesar is considered by historians to be Rome's greatest emperor. He rose to power after Julius Caesar's assassination and established himself as the first emperor of Rome. Augustus is regarded as the founder of the Roman Empire and ruled from 27 BCE until his death in 14 CE. He consolidated power, created a system of government, and implemented reforms that brought stability and prosperity to Rome.