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Commodus was the Roman emperor who ruled before Pertinax. Commodus was the son of Marcus Aurelius, a renowned Stoic philosopher and emperor. While his father was known for his wisdom and just rule, Commodus gained a reputation for cruelty, extravagance, and narcissism. His reign, marked by autocratic tendencies and conflicts with the Roman Senate, ultimately led to a conspiracy that ended his life in 192 AD.