The Nerva-Antonine dynasty ended with the assassination of Commodus (177–192). Commodus' reign ended a period of good government, known as the Five Good Emperors, and is credited with being the beginning of the Decline and Fall of the Roman Empire, following the era of the "High Empire" (70–192 AD). There followed another period of instability, the Year of Five Emperors, until Septimius Severus (193–211) became Emperor, initiating the Severan dynasty (193–235).