Black Death

The Black Death was a plague pandemic that occurred in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people died, perhaps 50% of Europe's 14th-century population. The disease is caused by the bacterium Yersinia pestis and is spread by fleas and through the air.

One of the most significant events in European history, the Black Death had far-reaching population, economic, and cultural effects. It marked the beginning of the second plague pandemic. The plague created religious, social, and economic upheavals, shaping the course of European history in profound ways.

The Black Death was the second great natural disaster to strike Europe during the Late Middle Ages, following the Great Famine of 1315–1317. It is estimated to have killed between 30% to 60% of the European population, as well as about 33% of the population in the Middle East. Even after the initial outbreak, the plague continued to recur, and the European population did not return to its 14th-century levels until the 16th century.

Origin

The Black Death started around 7,000 years ago when the bacteria Yersinia pestis first appeared. It spread mainly through fleas on rats. The disease reached Europe in 1347, likely carried by ships from Crimea to places like Constantinople, Sicily, and the Italian Peninsula. It then spread quickly from person to person.

Researchers found early evidence of the plague in Kyrgyzstan near Lake Issyk-Kul in the late 1330s, showing that the bacteria was already present before it reached Europe.

Social and cultural impact

Effect on the Mongol Empire

The Mongol Empire, founded by Genghis Khan, was already divided into four parts when the Black Death began in the 1330s. The plague disrupted trade routes that the Mongols depended on, leading to the deaths of many important leaders and causing political problems. This weakness helped bring an end to Mongol rule in many areas.

Chagatai Khanate (Central Asia)

The Chagatai Khanate was where researchers found evidence of the bacteria that caused the Black Death. This area was central to the spread of the disease across Asia and into Europe because it connected the east and west through trade routes.

Golden Horde (Russia)

The Golden Horde helped spread the Black Death to Europe. In 1346, during a siege of a city called Caffa, the plague caused many deaths among the attackers. This event is thought to have helped carry the disease to other parts of the world.

Ilkhanate (Persia)

The Ilkhanate in Persia faced serious problems after its leader died in 1335. Some historians believe the Black Death may have arrived there earlier than recorded, contributing to these difficulties.

Yuan Dynasty (China)

In China, the Yuan Dynasty fell in 1368 partly because of the Black Death, along with other problems like famine and flooding. These issues led to a rebellion that ended Mongol rule and started the Ming Dynasty.

Effect on India

In India, there were severe disease outbreaks around 1334–1335 and 1344, but it is unclear if they were caused by the Black Death. One account describes a quick and deadly illness that affected a large part of an army, though it may have been another type of disease.

Names

European writers during the time of the Black Death called the disease many names, such as pestis or pestilentia, meaning 'pestilence', and mortalitas, meaning 'mortality'. In English, people called it the "pestilence" or "great pestilence". The name "Black Death" was not used until much later, first appearing in English in the 1750s, borrowed from Danish: den sorte død, meaning 'the black death'.

The phrase "black death" had been used in other contexts long before this. Ancient writers like Homer used it to describe dangerous forces, and it was sometimes used for other deadly diseases. Over time, the name "Black Death" became the common way to refer to this terrible pandemic.

Previous plague epidemics

Main articles: Plague (disease) and First plague pandemic

Research suggests that the plague may have infected humans in Europe and Asia thousands of years ago, even back to around 3000 BCE. Scientists have found signs of the bacteria that causes plague in very old remains.

Later, during the time of the Roman Empire, doctors described symptoms that match what we now know as bubonic plague. One big outbreak happened long ago between 541 and 549 CE, called the plague of Justinian, which was also caused by the same bacteria. This was known as the first plague pandemic.

14th-century plague

The Black Death was a devastating plague pandemic that swept through Europe from 1346 to 1353. It was caused by the bacterium Yersinia pestis, which spread mainly through fleas carried by rats. This disease killed an estimated 25 to 60% of Europe’s population, making it one of the deadliest pandemics in history.

People at the time had different ideas about why the plague happened. Some believed it was caused by a bad mix of planets or punishment from God. Modern science, however, knows that fleas carrying the Yersinia pestis bacterium were responsible. The disease spread as rats fled drier areas into crowded towns and cities, carrying infected fleas with them.

The Black Death had huge effects on Europe. Many towns lost a large part of their population, leading to labor shortages. This sometimes meant higher wages for workers but also caused inflation. The sudden drop in population changed social structures and may have contributed to the start of the Renaissance in Italy. The idea of quarantine began during this time, with cities like Dubrovnik isolating travelers for 40 days to prevent the spread of the disease.

Recurrences

Second plague pandemic

Main article: Second plague pandemic

The plague returned many times over the centuries, affecting Europe and the Mediterranean area from the 1300s to the 1600s. It appeared almost every year somewhere in Europe between 1346 and 1671. Major outbreaks happened in many years, such as 1360–1363, 1374, 1400, and even as late as 1664–1667. The disease also impacted parts of Africa, the Middle East, and Asia. For example, in France, millions of people died from the plague between 1600 and 1670. In Italy, around 1.7 million people died in the first half of the 1600s, and in Spain, more than 1.25 million people died in the 1600s.

Third plague pandemic

Main article: Third plague pandemic

A later wave of the plague began in the mid-1800s in China and spread worldwide. It caused many deaths, especially in India, where about 10 million people passed away. Scientists in the late 1800s discovered the bacteria that caused the disease. Australia saw twelve outbreaks between 1900 and 1925, leading to over 1,000 deaths mainly in Sydney. The first known outbreak in North America occurred in San Francisco from 1900 to 1904.

Modern-day

Today, doctors treat plague with special medicines and vaccines. There is concern that the bacteria might become resistant to these medicines, making it harder to treat. In 1995, a resistant form was found in Madagascar, and in 2014 and 2017, Madagascar faced serious outbreaks. With modern treatments, most people who get the plague survive, though it can still be dangerous in areas with less medical care.