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When did Marcus Aurelius rule the Roman Empire?

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Bronze equestrian statue of Marcus Aurelius with his right arm raised, seated on a horse, at Piazza del Campidoglio in Rome, Italy. — Marcus Aurelius Marcus Aurelius, bronze equestrian statue in the Piazza del Campidoglio, Rome.

Marcus Aurelius served as the emperor of the Roman Empire from 161 to 180 CE.123