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How long did the Pax Romana last?

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Map showing the maximum territorial extent of the Roman Empire in AD 117, shaded in yellow, spanning from western Europe and North Africa to the Near East. Major rivers and seas are labeled, and various symbols mark the locations of Roman colonies and municipia established during the Pre-Caesarian, Caesarian, and Augustan periods. The boundary at the death of Emperor Trajan is highlighted.
Roman Empire

The Pax Romana, or "Roman peace," was a period of relative tranquility that lasted for approximately 200 years. It began with the reign of Augustus in 27 BCE and concluded with the reign of Marcus Aurelius in 180 CE.12