Final answer:
The Pax Romana, an era of Roman power and prosperity, began with the rule of Augustus Caesar and lasted from 27 B.C. to A.D. 180.
Step-by-step explanation:
The Pax Romana, a time of Roman power and prosperity, began with the reign of Augustus Caesar. This period, which spans from 27 B.C. to A.D. 180, is marked by relative peace within the Roman Empire and a significant rise in power and wealth. It is a testament to the effective leadership and policies set by Augustus Caesar and his successors, which facilitated a golden era of peace, stability, and expansion for Rome.
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