History of the Roman Empire founder of the brief Flavian dynasty, to be followed by the Nerva–Antonine dynasty which produced the "Five Good Emperors": Nerva, Trajan, Hadrian, Antoninus Pius and the philosophically inclined Marcus Aurelius. In the view of the Greek historian Dio Cassius, a contemporary observer, the accession of the emperor Commodus in 180 AD marked the descent "from a kingdom of gold to one of rust and iron"—a famous comment which has led some historians, notably Edward Gibbon, to take Commodus' reign as the beginning of the decline of the Roman Empire. In 212, during the reign of Caracalla, Roman citizenship was granted
Fall of the Western Roman Empire the reasons for the survival of the Eastern Roman Empire). Comparison has also been made with China after the end of the Han dynasty, which re-established unity under the Sui dynasty while the Mediterranean world remained politically disunited. From at least the time of Henri Pirenne scholars have described a continuity of Roman culture and political legitimacy long after 476. Pirenne postponed the demise of classical civilization to the 8th century. He challenged the notion that Germanic barbarians had caused the Western Roman Empire to end, and he refused to equate the end of the Western Roman Empire with the