Final answer:
Octavian, also known as Augustus Caesar, initiated the Pax Romana, a period of peace and prosperity in the Roman Empire that lasted approximately 200 years.
Explanation:
Octavian, also known as Augustus Caesar, initiated the Pax Romana around 30 BCE, marking a period of relative peace and prosperity in the Roman Empire that lasted approximately 200 years until the death of Emperor Marcus Aurelius. Augustus rose to power after the assassination of Julius Caesar and strategically established himself as the first Roman Emperor, laying the foundation for the Roman Empire.
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