The Black Death is the name given to the second major outbreak of plague in recorded history, and it swept through Europe between 1347 and 1351. The disease arrived in Europe in October 1347, when ships returning to the port of Messina in Sicily carried infected sailors. From there it spread along trade routes by land and sea, reaching most of the continent within a few years. The outbreak was caused by the bacterium Yersinia pestis, the same organism responsible for plague today.
The timing matters because it separates the Black Death from two other plague pandemics. An earlier outbreak, the Plague of Justinian, struck the Byzantine Empire in the sixth century. A third pandemic began in China in the mid-1800s and spread worldwide through shipping in the decades that followed. The Black Death sits squarely in the middle of that timeline.
When Did The Black Plague Happen?
The Black Death reached Europe in 1347 and had spread across most of the continent by 1351. The first known European landfall was at Messina, Sicily, in October 1347. Ships from the Black Sea region arrived with crew members already sick or dead.
From Sicily, the disease moved quickly along established trade networks. It hit the Italian port cities of Genoa, Venice, and Pisa within months. It reached Marseille in France in late 1347 and spread up the Rhône valley. England saw its first cases in the summer of 1348, and the disease reached London by autumn of that year. It moved into Scandinavia and Eastern Europe by 1349 and 1350.
The spread followed people, not geography. Plague traveled with merchant ships, overland caravans, and the movement of refugees fleeing infected towns. That pattern explains why coastal cities and trade hubs were struck first and hardest.
The pandemic did not end cleanly in 1351. The first wave burned out, but plague returned in repeated outbreaks for centuries afterward. Some historians refer to this long tail as the “Second Pandemic,” which lasted in Europe in various forms into the 1700s.
Where Did the Black Death Come From?
The Black Death originated in Asia and traveled west along trade routes. Most historians and scientists point to Central Asia as the likely starting region, though the exact location is still debated. Research published in the journal Nature in 2022 identified a possible origin in what is now Kyrgyzstan, based on DNA analysis of ancient remains. That finding is strong but not universally accepted as the final word.
The bacterium Yersinia pestis lives in rodent populations, particularly certain species of marmots, rats, and other small mammals. Fleas that feed on infected rodents can carry the bacteria and transmit it to humans. This rodent-flea-human cycle is the core mechanism of plague transmission and remains so today.
The disease moved from Asia toward the Middle East and then into the Mediterranean. The Mongol Empire’s trade networks and the busy shipping lanes of the Black Sea connected Asia to Europe in ways that made rapid spread possible. The siege of the Crimean city of Kaffa in 1346 is often cited in accounts of the outbreak’s westward movement, though some of the details in those historical accounts are uncertain.
How Long Did the Black Death Last?
The first and deadliest wave lasted roughly four years, from 1347 to 1351. Within that window, the disease killed a large share of Europe’s population. Estimates vary widely because medieval records are incomplete, but many historians put the death toll at somewhere between one-third and one-half of Europe’s people. Those figures are debated and should be treated as estimates, not exact counts.
The pandemic as a whole lasted much longer. Plague outbreaks recurred across Europe for the next several centuries. Major outbreaks struck in the 1360s, the 1400s, and the 1600s. The Great Plague of London in 1665 was one of the last major European outbreaks of this long second pandemic.
So the answer depends on how you define “the Black Death.” If you mean the initial catastrophic wave, it lasted about four years. If you mean the era of plague that it began, it stretched across roughly three centuries.
How Did the Plague Spread So Fast?
Speed came from three things: trade routes, crowded cities, and the biology of the disease itself. Europe in the 1300s had dense port cities with poor sanitation and large rodent populations. Once Yersinia pestis arrived in a city, conditions were favorable for it to spread.
Plague takes three main forms, and all three appeared during the Black Death:
- Bubonic plague is the most common form. Bacteria enter through the skin, usually from a flea bite, and travel to lymph nodes, which swell into painful lumps called buboes. This form does not spread from person to person.
- Septicemic plague is an infection of the blood. It can develop from a flea bite or from untreated bubonic plague.
- Pneumonic plague is an infection of the lungs. Unlike the bubonic form, it can spread from person to person through respiratory droplets.
Pneumonic plague is the form that can transmit directly between humans, and it is the most lethal. Some researchers have argued that person-to-person respiratory spread played a larger role in the Black Death than the classic rat-flea model suggests. That question is still studied and not fully settled.
One detail worth knowing: the rats most often blamed, black rats, are not the only possible carriers. The disease can move through many rodent species and their fleas. The exact mix of transmission routes during the 1300s is still an active area of research.
Did the Black Death Happen Only Once?
No. Plague has struck in three major pandemics, and smaller outbreaks have occurred many times. The Black Death was the second of the three.
| Pandemic | Approximate Timing | Region |
|---|---|---|
| Plague of Justinian | 541 to roughly 750 CE | Byzantine Empire and Mediterranean |
| Black Death (Second Pandemic) | 1347 to 1351 for the first wave; recurring outbreaks for centuries after | Europe, Asia, Middle East, North Africa |
| Third Pandemic | Began in the mid-1800s; spread globally over the following decades | Worldwide |
The third pandemic began in China and spread through global shipping. It reached ports on multiple continents and led to major outbreaks in India, Hong Kong, and elsewhere. That pandemic is the one that gave scientists the modern understanding of how plague spreads, largely through the work of researchers who identified the bacterium and its flea vector in the late 1800s.
Does Plague Still Exist Today?
Yes. Plague is still with us. The World Health Organization classifies it as a re-emerging disease, and cases are reported every year. Most human cases today occur in a small number of countries in Africa, Asia, and the Americas.
In the United States, plague is rare. The Centers for Disease Control and Prevention reports a small number of human cases in a typical year, mostly in the southwestern states, particularly New Mexico, Arizona, and Colorado. The bacteria persist in wild rodent populations in those areas.
Modern plague is treatable. Several antibiotics are effective when started early, which is why prompt medical care matters for anyone with symptoms after possible exposure. This is a genuine difference from the 1300s, when no effective treatment existed. The disease itself has not changed much; our ability to treat it has.
Plague is also preventable in ways that were not possible in the Middle Ages. Avoiding contact with wild rodents and their fleas, and using flea control on pets in endemic areas, reduces risk. No vaccine is currently available for general use in the United States.
Why the Timing Still Matters
The Black Death’s timing shaped European history in ways that are still studied. The population loss was so large that it changed labor markets, land ownership, and wages across the continent. With fewer workers, surviving laborers gained more bargaining power. Some historians link these shifts to long-term changes in European society and economics.
The outbreak also changed how people understood disease. Medicine in the 1300s had no concept of bacteria. Explanations centered on bad air, divine punishment, and imbalances of bodily humors. The true cause was not identified until the late 1800s, more than five centuries later.
That gap is worth pausing on. People living through the Black Death had no accurate model of what was happening to them. The correct explanation existed in nature the whole time, but the tools to find it did not. It is a reminder that understanding a disease and experiencing it are very different things.
Frequently Asked Questions
When exactly did the Black Death start and end?
The first European cases appeared in October 1347 in Sicily, and the initial wave had spread across most of Europe by 1351. Plague outbreaks recurred for centuries afterward, so the pandemic’s full span is much longer than those four years.
Was the Black Death in the 1300s or 1400s?
The Black Death itself was in the 1300s, with its deadliest wave between 1347 and 1351. Later plague outbreaks continued into the 1400s and beyond as part of the same long pandemic era.
How many people died from the Black Death?
Estimates vary because medieval records are incomplete, but many historians put the toll at roughly one-third to one-half of Europe’s population. These figures are debated and should be treated as approximations.
Is the plague still around in 2024?
Yes. Plague cases are reported every year, mostly in parts of Africa and Asia, with a small number in the southwestern United States. Modern antibiotics can treat it effectively when started early.
