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In 193 AD, five different men held the title of Emperor. The Praetorian Guard assassinated Petrinax when he tried to reform the Imperial Bodyguard. His successor bought the Imperial throne before Septimius Severus overthrew him. <ref> Historia Augusta, Life of Petrinax, 8 2</ref> Severus fought two bitter civil wars to secure his claim to the throne. Commodus's disastrous reign led to the most protracted period of instability in the Imperial lands since 66 AD. However, Septimius Severus proved that he was an able leader and stabilized the chaotic Empire a year after Commodus's assassination. The reign of the man who was obsessed with the Games and gladiators was one that ended the political stability that Rome had enjoyed for almost a century. <ref>Speidel, p 110</ref>

Marcus Aurelius was arguably one of the most respected Roman rulers and one of its greatest philosophers. His son, Commodus, was completely unsuited by temperament and character to be the sole ruler of an extensive state. He revolted against his father's influence and Stoic education and acted contrary to what had been expected of him. He also became increasingly mentally unstable sometime during his reign. Commodus is arguably one of the worst emperors in its history.