What was the name of the new era of peace ushered in after Octavian defeated Mark Antony and Cleopatra at the Battle of Actium in 31 BCE, ending all the wars in the Roman world for nearly 200 years?

Pax Romana

Explanation:

The period of Pax Romana started with the accession of Octavian to the throne in 27 BC. When Octavian became the first Roman Emperor, he took the name of "Augustus", which means "majestic" in Latin. For this reason, this period is aslo sometimes referred to as Pax Augusta.

During Pax Romana, there was relative peace in the Empire, and the Empire reached its maximum power and extent. It peaked territorially under Trajan a century after, when even parts of Persia were under Roman control.

The Pax Romana ended in 180 AD, after the death of Marcus Aurelius, the last of the five good emperors. After this period, the Roman Empire would start a slow decline until its final division and collapse.

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