Final answer:
Augustus, the great-nephew of Julius Caesar, was the first Roman emperor and the founder of the Roman Empire. He initiated the era known as Pax Romana, which was a period of peace in the Roman Empire that lasted for approximately 200 years.
Step-by-step explanation:
The subject of this question is History. Augustus, the great-nephew of Julius Caesar, was the first Roman emperor and the founder of the Roman Empire. He initiated the era known as Pax Romana, which was a period of peace in the Roman Empire that lasted for approximately 200 years. Augustus expanded the Roman Empire's territories, created a standing army, upgraded Roman infrastructure, and implemented various reforms and policies to bring order and prosperity to Rome. He ruled from 27 BCE until his death in 14 CE.