Why did the Roman Empire fall? The classic answer is given by Edward Gibbon (1737 — 1794), in chapter 38 of the third volume of The History of the Fall and Decline of the Roman Empire (1776 — 1789):
The decline of Rome was the natural and inevitable effect of immoderate greatness. Prosperity ripened the principle of decay; the causes of destruction multiplied with the extent of conquest; and as soon as time or accident had removed the artificial supports, the stupendous fabric yielded to the pressure of its own weight.
Kyle Harper, Senior Vice President and Provost of the University of Oklahoma, seeks to complement Gibbon’s account by emphasising the role of nature, and specifically climate change and infectious disease, in the fall of Rome in his provocative, exceptionally well-written book The Fate of Rome: Climate, Disease and the End of an Empire. Is Harper correct? Were plagues and climate events fatal for Rome?
Harper accepts the conventional view that Rome’s civilizational collapse began in the later second century AD, accelerated amidst chaos and bloodshed during the third century, and culminated in the humiliations of the fifth century, when Rome was famously sacked by barbarians, and the last, weak, insignificant Roman Emperor was pushed off the throne in AD 476.
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Harper begins The Fate of Rome with a description of Rome as it advertised itself in AD 400. Contemporary inventories record: 28 libraries, 19 aqueducts, two circuses, 37 gates, 423 neighborhoods, 46,602 blocks of flats, 1,790 grand houses, 290 granaries, 856 public baths, 1,352 cisterns, 254 bakeries, 46 brothels, and 144 public latrines. The population is estimated at 700,000 or so. This figure diminished rapidly after August 24th, AD 410, when Rome was sacked by an army of Goths.
The traditional date of Rome’s fall is September 4th, AD 476, when the 16-year-old Emperor Romulus Augustus, the son of a former secretary to Attila the Hun, was forced to abdicate the throne by a barbarian warlord, and dismissed to spend the rest of his days at a seaside villa near Naples. His date of death is not recorded; he was too unimportant to fear assassination. At this point, the city of Rome’s population was still as high as 400,000.
Rome was invaded and sacked a few times over the centuries; more and more of it was abandoned; by the 10th century it was a suburb to nowhere surrounded by malarial swamps, and may have had only 9,000 inhabitants. Most of the economy was related to religious pilgrimages; the city was controlled by gangsters and petty warlords. What was left amidst the ruins was sacked again in AD 1084 by an army that outnumbered residents by as much as three to one.
