The wise stoic reign of Marcus Aurelius, beloved by all, was followed by the murderous reign of Commodus, hated and feared by all, who would be assassinated by his closest companions. The disastrously reckless cruelty of Commodus, and his neglectful reign, which nearly caused the disintegration of the Roman Empire, colors the opinion of both ancient and modern historians. What historians mention, but do not emphasize, are the similarities between the soldier Hadrian and Commodus. Both liked to fight in the ring as gladiators. Both decided to halt the Roman policy of expansion, seeking strategic withdrawal. And Marcus Aurelius was as wary of his adoptive grandfather Hadrian as he was of his wayward son Commodus. […]