The Black Death (1347-1351): The Deadliest Plague in Human History

[00:00:00]The Black Death is one of the most documented events in human history.

[00:00:05]There are already countless documentaries, books, and films about it, just as there are for many of the stories we cover on this channel. So why tell it again? Because here at the Retro Review, we don't just revisit history.

[00:00:20]We explore the people, the decisions, and the events that change the world.

[00:00:26]Then leave the final judgment to you. As you watch, ask yourself, was the Black Death simply an unstoppable disease? Or did fear, war, trade, and human decisions make it far worse? Stay until the end. Share your thoughts in the comments. And let us know which historical event or figure you'd like us to cover next. This is the story of the deadliest pandemic in recorded history.

[00:00:55]This is the Black Death in the middle of the 14th century. A disease swept out of the east and across the known world, killing so many people so quickly that entire towns fell silent. Fields went unh harvested and some of the living came to believe the end of the world had arrived. In the span of about 7 years, the Black Death killed an estimated 75 to 200 million people, somewhere between a third and a half of Europe's entire population, along with staggering losses across Asia, the Middle East, and North Africa. This is the story of the deadliest pandemic in recorded human history.

[00:01:41]How it began, how it spread, who tried to stop it, and how it permanently changed the world it left behind. The story does not begin in Europe, but far to the east on the steps of Central Asia, where a bacterium called pestis had likely circulated for centuries among wild rodent populations. largely undisturbed by human contact, this bacterium causes the disease known as plague, and it is carried primarily by fleas that live on rodents, especially black rats, which had long since adapted to living alongside humans in granaries, homes, and the holds of trading ships. When an infected flea bites a human or when the bacteria enter through a break in the skin, it can trigger one of several devastating forms of the disease. The most common bubonic plague causes the bacteria to travel to the lymph nodes producing the swollen blackened lumps known as bubose most often in the groin, armpit or neck along with fever, chills and exhaustion.

[00:02:59]In its more severe forms, the infection could spread to the bloodstream causing septase plague or to the lungs causing pneumonic plague which could then spread directly from person to person through coughing without any flea or rat required at all making it especially fast and lethal. Historians and scientists studying ancient DNA now believe this particular strain of plague likely emerged from a reservoir of infected marmets and other rodents somewhere in the region of the Tianan mountains along what is now the border of Kyrgyzstan and China sometime in the early 14th century. From there, the disease appears to have moved along the network of trade routes, collectively known as the Silk Road, the very same arteries of commerce that had for centuries connected the wealth and culture of East Asia to the markets of the Middle East and Europe. War unfortunately sped its journey along in ways trade alone might not have. In 1346, a Mongol army under the command of Jani Beg, Khn of the Golden Horde laid siege to the Genoies trading outpost of Kafa, a fortified port city on the Crimean Peninsula on the Black Sea. According to an account written some years later by an Italian notary named Gabriel de Musis, the besieging Mongol forces ravaged by plague within their own ranks made a grim decision, catapulting the bodies of plague victims over the walls of Kafa in an effort to infect the city's defenders in what historians now widely regard as one of the earliest recorded instances of biological warfare. Though the precise details and reliability of Demus' secondhand account remain debated among scholars, whether the siege of Kafa was the singular point of origin or simply one node in a far broader web of transmission already spreading westward. The effect that followed was undeniable.

[00:05:20]Genoies, merchants, and sailors fled the besieged city aboard trading galleys, unknowingly carrying with them the infected rats, fleas, and the bacteria itself, sailing west across the Mediterranean toward home.

[00:05:37]In October 1347, a fleet of Genoies trading ships arrived at the Sicilian port of Messina. And what the people who greeted those ships found aboard would become one of the most chilling images in medieval history. Most of the sailors aboard were already dead. Those still alive were gravely ill, covered in the swollen black boss that would soon give the disease its enduring dreadful name.

[00:06:08]Contemporary accounts describe the sick as barely able to stand, their skin marked with dark, spreading blotches caused by bleeding beneath the surface.

[00:06:20]A symptom that some later writers believed gave rise to the very name black death, though that particular label would not become common until centuries afterward. At the time, people simply called it the great mortality or the pestilence words that carried their own weight of dread. The horrified authorities of Msina ordered the ships expelled from the harbor, but it was already too late.

[00:06:52]Rats had already slipped down mooring lines onto the docks. fleas had already found new hosts among the dock workers who had unloaded cargo before the danger was understood and the plague had reached European soil. It would not be contained. The disease killed with a speed that seemed to those living through it almost supernatural.

[00:07:18]Contemporary physicians and chronicers described a progression that could run its course in a matter of days, sometimes even hours, from the first signs of fever and exhaustion to death itself. A person might wake healthy and be dead by nightfall. This astonishing speed was part of what made the plague so psychologically devastating, denying communities even the small comfort of a lingering illness in which loved ones might say goodbye, receive last rights, or make peace with what was coming.

[00:07:52]Graves were dug in advance in some cities simply to keep pace with the rate of death. And in many places, individual burial was abandoned altogether in favor of enormous communal pits, later uncovered by archaeologists that could hold hundreds of bodies layered one at top another. From Sicily, the disease spread with terrifying speed, carried along the same trade routes and shipping lanes that had made medieval Europe increasingly interconnected and increasingly vulnerable. By early 1348, plague had reached the Italian mainland, striking the great trading cities of Genoa, Venice, and Pisa, and from there spreading north and west into France, arriving in the great port city of Marseilles, and eventually reaching Paris, then one of the largest cities in Europe, by the summer of that same year.

[00:08:50]England was reached by the disease later in 1348, arriving via the port of Melkcom in Dorset, then spreading to Bristol and eventually to London itself. By 1349, the plague had reached Scandinavia and Eastern Europe. And by the early 1350s, it had touched nearly every corner of the continent, from Iceland and Greenland in the far north to Russia in the east, sparing almost no region entirely.

[00:09:23]The scale of death once the plague arrived in a given city or town was almost impossible for contemporaries to comprehend and remains staggering even by modern standards.

[00:09:37]in Florence, one of the wealthiest and most populous cities in Europe, chronicers of the time, including the writer Giovani Bokeachio, who would later use the plague as the framing device for his famous collection of stories. The Damearan described a city where as much as half the population may have perished within a matter of months.

[00:10:01]Bukacio wrote of a disease so contagious that merely touching the clothing of the sick seemed to transmit it, of family members abandoning one another out of terror, and of the dead being carried to mass graves in such numbers that ordinary burial practices simply collapsed under the weight of the dying.

[00:10:22]In the port cities that plague reached first, the devastation was often swiftest and most severe, as densely packed populations, poor sanitation, and thriving rat populations created ideal conditions for transmission.

[00:10:38]Venice, a city built on trade and dense urban living, lost an enormous share of its population, with some estimates suggesting three out of every five residents died. In smaller towns and rural villages, the disease could arrive and in a matter of weeks, leave entire settlements without enough living people to bury the dead, harvest the fields, or care for the surviving young and elderly, causing a secondary wave of deaths from starvation and neglect that compounded the plague's direct toll. The plague showed little regard for rank or title, and among its victims were several figures whose deaths sent shock waves through the royal courts of Europe. King Alonso the 11th of Castile died of plague in 1350 while personally commanding the siege of Gibralar, becoming the only reigning European monarch known to have died directly of the disease. his death forcing an abrupt end to the campaign he had led. Joan of England, daughter of King Edward III, died of plague in 1348 at the age of just 14 while traveling to Castile for her own wedding. Her death delivered to her grieving father in a letter that survives to this day, one of the more poignant personal records to emerge from the catastrophe.

[00:12:07]The clergy, whose duties require them to sit with the dying, hear confessions, and administer last rights in close physical proximity to the infected, suffered mortality rates that in many regions exceeded even those of the general population, a pattern that left parishes across Europe without priests and contributed in the decades that followed to a noticeable decline in the church's his overall authority and prestige as survivors questioned why so many men of God had proven unable to save themselves, let alone their flocks.

[00:12:48]Medieval medicine, still largely rooted in the ancient theories of the Greek physician Galen, had no meaningful understanding of germs, bacteria, or the true mechanism of contagion, and was consequently almost entirely powerless against the disease. Physicians of the era generally believed illness arose from an imbalance of the body's four humors, blood, flem, black bile, and yellow bile, or from corrupted air, referred to as myasma, thought to arise from decaying matter or unfavorable alignments of the planets. In Paris, a group of physicians at the University of Paris, commissioned by King Philip V 6th of France to investigate the cause of the epidemic, produced a widely circulated report in 1348, attributing the plague to a conjunction of Saturn, Jupiter, and Mars that had occurred in 1345, believed to have corrupted the air across great distances.

[00:13:55]Treatments offered by physicians of the era, guided by these mistaken theories, range from useless to actively harmful.

[00:14:04]Bloodletting, intended to rebalance the body's humors, was widely practiced on plague victims already gravely weakened by fever and infection.

[00:14:15]Other remedies included the burning of aromatic herbs and woods to purify supposedly corrupted air, the carrying of nose gaze or pomanders filled with sweet smelling flowers, and herbs to ward off miasma believed to be the origin of later folk traditions and rhymes associated with the plague. and in more desperate cases, the application of onions, herbs, or even live animals to the swollen booos in an attempt to draw out the corruption.

[00:14:49]None of these approaches had any real effect on the underlying bacterial infection, and doctors who treated plague victims directly frequently contracted the disease themselves and died alongside their patients.

[00:15:03]Out of this medical desperation emerged one of the most enduring images associated with the black death. The plague doctor, identifiable by a long waxed overcoat, gloves, and a distinctive bird-like mask with a long beak stuffed with aromatic herbs and dried flowers worn in the belief that filtering the supposedly poisoned air through fragrant material could protect the wearer from infection. Though this iconic costume is more strongly associated with later outbreaks of plague in the 17th century than with the initial 14th century pandemic itself.

[00:15:44]Plague doctors often less experienced or credentialed physicians hired specifically by towns and cities to treat the poor and record plague deaths.

[00:15:56]when established doctors refused the enormous personal risk became a recognizable and somewhat feared feature of plague ravaged communities. As the death toll mounted and no rational explanation or effective treatment emerged, medieval society gripped by terror and searching desperately for meaning turned in several dark and consequential directions. Religious responses to the plague were widespread and varied enormously in character.

[00:16:30]Many people turned to increased piety, prayer, and religious processions, believing the plague to be a divine punishment for humanity's sins. In several regions, particularly in Germany and parts of the low countries, this took the form of the fleellant movement.

[00:16:49]groups of penitants who traveled from town to town publicly whipping themselves with knotted scorges, sometimes studded with metal in acts of extreme penance intended to appease what they believed was God's wrath, drawing large and increasingly fervent crowds as they moved through plaguerstricken regions. Though the movement was eventually condemned by Pope Clement V 6th in 1349 amid concerns over the flegellant's growing defiance of church authority and their contribution to social unrest. Far more tragic and consequential was the wave of violent scapegoating that swept across parts of Europe as communities searched for someone to blame for the incomprehensible suffering around them.

[00:17:37]Jewish communities across much of Europe, particularly in Germanspeaking territories, France and Spain, became targets of horrific violence, accused in a wave of conspiracy theories of deliberately poisoning wells and water supplies to spread the disease.

[00:17:55]Accusations entirely without basis, but which spread with terrifying speed amid the panic and grief of the era.

[00:18:03]Beginning in 1348 and continuing through 1349, poggrams erupted across dozens of cities, resulting in the mass killing, expulsion, and forced conversion of Jewish populations in cities including Strasburg, where in February 1349, hundreds of Jewish residents were burned alive in a single mass execution, and Basil and Cologne, among many others, Pope Clement V 6th issued formal papal bulls in 1348 explicitly condemning the violence and declaring the accusations against Jewish communities baseless. Noting correctly that plague was killing Jewish people at the same rates as their Christian neighbors, a fact that should have disproven the poisoning theory entirely.

[00:18:59]His condemnations, however, did little to halt the violence in many regions, and the poggrams of the Black Death Era permanently altered the demographic map of Jewish settlement across Europe, driving many survivors eastward into Poland and Lithuania, regions that would remain centers of Jewish life for centuries afterward.

[00:19:22]Amid this landscape of terror, death, and social breakdown, the response of ordinary people and their communities varied enormously and left behind vivid firstirhand testimony that historians still draw on today.

[00:19:40]Giovani Boacio's description of Florence remains one of the most detailed contemporary accounts describing a complete collapse of normal social bonds where in his words brother abandoned brother, uncle abandoned nephew and in many cases parents abandoned their own sick children. So overwhelming was the fear of contagion. He described the wealthy fleeing to isolated country estates in an attempt to escape the disease, a practice that inspired the very structure of his book, in which 10 young Florentines shelter in a countryside villa, telling stories to pass the time while the plague rages in the city behind them. In England, contemporary chronicers, including Henry Knighton, a cannon at the Abbey of St. Mary of the Meadows in Leicester documented not only the horrifying death toll, but its immediate and dramatic economic consequences.

[00:20:43]Nighton wrote of entire villages left with no surviving inhabitants at all, of livestock wandering untended through fields because there was no one left to hurt them, and of a sudden drastic labor shortage that upended the rigid economic and social structures of feudal England almost overnight.

[00:21:05]With so many agricultural laborers dead, the survivors for the first time in generations found themselves in a position to demand higher wages for their labor. A shift so alarming to land owners and the English crown that Parliament passed the statute of laborers in 1351.

[00:21:27]an attempt to legally cap wages at pre-plague levels and compel laborers to accept work at those rates. An effort at economic control that largely failed in practice and that many historians point to as a contributing factor in the social unrest that would eventually culminate in the peasants revolt of 1381.

[00:21:52]This economic disruption, so devastating and chaotic in the moment, would in time reshape European society in ways that outlasted the plague itself by centuries. The sudden catastrophic reduction in population fundamentally altered the balance of power between labor and land ownership across much of Europe. With so many fewer workers available, surviving peasants and laborers gained unprecedented leverage to negotiate better wages, better working conditions, and greater personal freedom, contributing to the gradual erosion of the rigid feudal system that had structured European society for centuries. Land suddenly abundant relative to the shrunken population became cheaper while labor became relatively more valuable. a fundamental economic realignment that some historians credit as an early contributing factor to the eventual decline of surfom in Western Europe and in the very long term to social and economic changes that would help lay groundwork for the Renaissance that followed in the centuries after. The black death also left a profound mark on European art, literature, and culture that persisted long after the initial pandemic subsided. The recurring artistic motif known as the dance macabra or dance of death depicting skeletal figures leading people of every social rank from popes and kings to peasants and children in a grim procession toward the grave emerged and flourished in the decades following the plague. A visual reminder of the disease's terrifying indifference to wealth, status, or piety.

[00:23:50]Religious art of the period increasingly emphasized themes of mortality, judgment, and the fragility of earthly life, a cultural preoccupation with death that would echo through European art and literature for generations.

[00:24:07]It is important to understand that the outbreak that struck between 1347 and roughly 1351, as devastating as it was, was not a single isolated event, but rather the first and most catastrophic wave of a disease that would return to European populations repeatedly over the following centuries in recurring outbreaks throughout the 14th, 15th, 16th and 17th centuries. Each subsequent wave typically less severe than the first as some degree of population immunity and eventually improved sanitation and quarantine practices took hold. Though none approached the staggering scale of the initial pandemic, the very word quarantine in fact originates from this era derived from the Venetian dialect term quaranti meaning 40 days referring to the period that ships arriving in Venetian controlled ports including the city of Ragusa were required to wait offshore before passengers and cargo could disembark.

[00:25:22]Ark, an early and remarkably precient public health measure adopted in 1377, decades before anyone understood the actual biological mechanism of contagion. It was designed to prevent.

[00:25:39]The true scientific understanding of what had caused the black death would not arrive until more than 500 years after the initial pandemic. It was not until 1894 during an outbreak of plague in Hong Kong that the Swiss French physician and bacteriologist Alexandra Yerin successfully identified the bacterium responsible for the disease which would later be named Yinia Pestis in his honor. working independently around the same time. The Japanese bacteriologist Kitasato Shibasaburo also conducted research into the same outbreak and the two scientists overlapping [gasps] and at times disputed findings helped establish for the first time the true bacterial cause of a disease that had terrorized humanity for over five centuries.

[00:26:39]Shortly after, the specific role of fleas and rats in transmitting the bacteria between animals and humans was established by additional researchers building on this foundational work.

[00:26:51]Finally providing a complete and accurate scientific explanation for a catastrophe that medieval society had been utterly unable to comprehend or combat. Modern estimates of the Black Death's total death toll vary considerably due to the limitations of medieval recordkeeping, but the consensus among historians and epidemiologists places European deaths somewhere between 30 and 60% of the entire population within just a few catastrophic years. A proportion of sudden loss almost without parallel in recorded human history.

[00:27:30]comparable in scale, some historians note, to what a modern nuclear war might inflict on a population, but compressed largely into the span of a single generation. Beyond Europe, the same pandemic, understood by modern historians to be part of a single interconnected pattern of transmission across Eurasia and North Africa, is estimated to have killed enormous numbers of people across the Middle East. including devastating losses in Cairo, then one of the largest cities in the world, and across large parts of Central and East Asia as well, making the Black Death not merely a European catastrophe, but a genuinely global one.

[00:28:16]One of the deadliest events in the entire span of human history. [gasps] By the time the first and most devastating wave of the pandemic finally began to subside in Europe around 1351 and 1352, the continent that emerged was in almost every measurable way, a different place from the one that had existed just 5 years earlier. Entire family lines had vanished. Skilled trades had lost so many practitioners that guilds struggled for a generation to rebuild their ranks.

[00:28:53]Universities lost faculty and students alike. And some, including the University of Cambridge's Corpus Christi College, were founded in the years immediately following the plague, specifically to train new clergy to replace those who had died.

[00:29:10]Wills and legal records from the period show a marked shift in how ordinary people approach death itself with far more detailed and anxious instructions for burial, for the distribution of property, and for prayers to be said for the soul of the deceased. a documented rise in what historians describe as a culture-wide preoccupation with mortality that would shape European religious and artistic life for generations.

[00:29:42]In the centuries since, the Black Death has remained a subject of intense historical fascination, not only for the sheer scale of its human toll, but for what it reveals about how societies respond to catastrophe beyond their comprehension or control. How fear can curdle into scapegoating and violence.

[00:30:03]How existing social and economic structures can be violently upended by sudden crisis. And how even amid almost unimaginable suffering, human communities found ways to endure, adapt, and eventually rebuild.

[00:30:20]The plague doctors in their strange beaked masks. The fleellants processing through terrified towns.

[00:30:28]Boacio's storytellers waiting out the horror in their countryside villa. The anonymous chronicers recording villages emptied of the living. And the millions upon millions of ordinary people who lived, suffered, and died without their names ever being recorded at all.

[00:30:47]together form the story of a disease that reshaped the medieval world and whose legacy in public health practices, in social and economic structures, and in the darker chapters of religious persecution it provoked can still be traced in the world we live in today.

[00:31:07]More than six centuries later, the Black Death remains one of history's greatest turning points. It changed societies, economies, medicine, and the course of civilization itself.

[00:31:24]But now, we'd like to hear from you.

[00:31:26]What do you think was the biggest reason the Black Death became so devastating?

[00:31:32]Share your opinion in the comments and tell us what historical event or figure you'd like us to cover next. If you enjoy this documentary, subscribe to the Retro Review, where we revisit the moments that change the world and let history start the conversation.

[00:31:53]Thank you for watching and we'll see you in the next chapter of history. Yeah.