The Pax Romana (Latin for "Roman peace") is a roughly 200-year-long period of Roman history which is identified as a golden age of increased and sustained Roman imperialism, relative peace and order, prosperous stability, hegemonic power, and regional expansion. This is despite several revolts and wars, and continuing competition with Parthia. It is traditionally dated as commencing with the accession of Augustus, founder of the Roman principate, in 27 BC and concluding in AD 180 with the death of Marcus Aurelius, the last of the "Five Good Emperors".
During this period of about two centuries, the Roman Empire achieved its greatest territorial extent in AD 117 (Emperor Trajan), and its population reached a maximum of up to 70 million people, which was around 33% of the world's population. According to Cassius Dio, the dictatorial reign of Commodus, later followed by the Year of the Five Emperors and the Crisis of the Third Century, marked the descent "from a kingdom of gold to one of iron and rust".

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