The Black Death: The Worst Event in European History

The Black Death map
Map showing the history and distribution of the black death around the world. (Wikimedia Commons/CC BY 4.0)

The Black Death was an epidemic which spread across almost all of Europe in the years 1346-53. The plague killed over a third of the entire population. It has been described as the worst natural disaster in European history and is responsible for changing the course of that history to a great degree.

There is no dispute that the Black Death, otherwise known as the “Great Mortality, ” or simply “The Plague,” was a trans-continental disease which swept Europe and killed millions during the fourteenth century. However, there is now argument over exactly what this epidemic was. The traditional and most widely accepted answer is the bubonic plague, caused by the bacterium Yersinia Pestis, which scientists found in samples taken from French plague pits where bodies were buried.


Yersinia Pestis was spread through infected fleas which lived first on black rats, a type of rat which is happy to live near humans and, crucially, on ships. Once infected, the rat population would die off, and the fleas would turn to humans, infecting them instead. After three to five days of incubation, the disease would spread to the lymph nodes, which would swell into large-blister like ‘buboes’ (hence ‘bubonic’ plague), usually in the thigh, armpit, groin, or neck. 60 - 80% of those infected would die within another three to five days. Human fleas, once blamed quite heavily, in reality, contributed only a fraction of cases.


The plague could turn into a more virulent airborne variant called pneumonic plague, where the infection spread to the lungs, causing the victim to cough up blood which could infect others. Some people have argued this aided the spread, but others have proven it wasn’t common and accounted for a very small amount of cases. Even rarer was a septicemic version, where the infection overwhelmed the blood; this was nearly always fatal.


The main instance of the Black Death was between 1346 to 1353, although the plague returned to many areas again in waves during 1361-3, 1369-71, 1374-75, 1390, 1400, and after. Because extremes of cold and heat slow the flea down, the bubonic version of the plague tended to spread during the spring and summer, slowing right down during winter (the lack of many winter cases across Europe is cited as further evidence the Black Death was caused by Yersinia Pestis).


The Black Death originated in the northwest shores of the Caspian Sea, in the land of the Mongol Golden Horde, and spread into Europe when the Mongols attacked an Italian trading post at Kaffa in the Crimea. Plague struck the besiegers in 1346 and then entered the town, to be carried abroad when the traders hurriedly left on ships the next spring. From there the plague traveled rapidly, through rats and fleas living on board ships, to Constantinople and other Mediterranean ports in the thriving European trade network, and from there through the same network inland.

By 1349, much of Southern Europe had been affected, and by 1350, the plague had spread into Scotland and north Germany. Overland transmission was, again, either via rat or fleas on people/clothing/goods, along communication routes, often as people fled the plague. The spread was slowed by cool/winter weather but could last through it. By the end of 1353, when the epidemic reached into Russia, only a few small areas such as Finland and Iceland had been spared, thanks largely to only having a small role in international trade. Asia Minor, the Caucasus, the Middle East, and North Africa also suffered.

Death Toll

Traditionally, historians accept that there were variations in the rates of mortality as different areas suffered slightly differently, but roughly one-third (33%) of Europe’s entire population succumbed between 1346-53, somewhere in the region of 20-25 million people. Britain is often quoted as losing 40%. Recent work by O.J. Benedictow has produced a controversially higher figure: he argues that mortality was surprisingly consistent across the continent and that, in reality, three-fifths (60%) perished; roughly 50 million people.

There is some dispute about urban versus rural losses but, in general, the rural population suffered as heavily as the urban ones, a key factor given that 90% of Europe’s population lived in rural areas. In England alone, deaths rendered 1000 villages unviable and survivors left them. While the poor had a higher chance of contracting the disease, the rich and noble still suffered, including King Alfonso XI of Castile, who died, as did a quarter of the Pope’s staff at Avignon (the papacy had left Rome at this point and hadn't yet returned).

Medical Knowledge

The majority of people believed the plague was sent by God, largely as a punishment for sins. Medical knowledge in this period was insufficiently developed for any effective treatments, with many doctors believing the disease was due to ‘miasma,’ the pollution of the air with toxic matter from rotting material. This did prompt some attempts to clean up and provide better hygiene – the King of England sent a protest at the filth in London’s streets, and people were afraid of catching the illness from affected corpses – but it didn’t tackle the root cause of rat and flea. Some people seeking answers turned to astrology and blamed a conjunction of the planets.

“End” of the Plague

The great epidemic ended in 1353, but waves followed it for centuries. However, medical and governmental developments pioneered in Italy had, by the seventeenth century, spread across Europe, providing plague hospitals, health boards, and counter-measures; plague consequently decreased, to become unusual in Europe.


The immediate aftermath of the Black Death was a sudden decline in trade and a halt to wars, though both of these picked up soon after. More long term effects were the reduction of land under cultivation and a rise in labor costs due to the vastly reduced laboring population, who were able to claim higher remittance for their work. The same applied to skilled professions in towns, and these changes, coupled with a greater social mobility, have been seen to underpin the Renaissance: with fewer people holding more money, they allotted more funds toward cultural and religious items. In contrast, the position of landowners weakened, as they found labor costs to be much more, and encouraged a turn to cheaper, labor-saving devices. In many ways, the Black Death sped up the change from the medieval to the modern era. The Renaissance began a permanent change in Europe's life, and it owes a great deal to the horrors of the plague. Out of decay comes forth sweetness indeed.

In Northern Europe, the Black Death affected culture, with an artistic movement focusing on death and what happens after, which stood in contrast to the other cultural trends in the region. The church was weakened as people grew disillusioned when it proved unable to satisfactorily explain or deal with the plague, and many inexperienced/swiftly educated priests had to be rushed into filling the offices. Conversely, many often richly endowed churches were built by grateful survivors.

The Name "Black Death"

The name ‘Black Death’ was actually a later term for the plague, and may derive from a mistranslation of a Latin term which means both ‘terrible’ and ‘black’ death; it has nothing to do with the symptoms. Contemporaries of the plague often called it “plaga,” or “pest”/”pestis.

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Wilde, Robert. "The Black Death: The Worst Event in European History." ThoughtCo, Aug. 27, 2020, Wilde, Robert. (2020, August 27). The Black Death: The Worst Event in European History. Retrieved from Wilde, Robert. "The Black Death: The Worst Event in European History." ThoughtCo. (accessed June 5, 2023).