Which emperor, son of Marcus Aurelius, was known for fighting as a gladiator? (r. 180-192 AD)

The story behind the answer

Commodus is correct: the son of the philosopher-emperor Marcus Aurelius, he reigned 180–192 AD and scandalized Rome by appearing as a gladiator in the Colosseum. He staged lopsided bouts, often using blunted weapons or fighting animals from safety, and charged the city enormous fees for his “performances,” damaging imperial dignity and finances.

To remember: Commodus = “combat-us.” He fancied himself a new Hercules, carried a club, and even renamed months and Rome itself after him. His theatrical vanity contrasted sharply with his father’s Stoic image and helped tarnish the prestige of the principate. His assassination on December 31, 192, ended the Antonine line and ushered in the chaotic Year of the Five Emperors.