Black Death (1346–1353): The Plague That Ravaged Europe

The Black Death was a devastating pandemic of plague that swept across western Asia, the Middle East, North Africa and Europe between 1346 and 1353. In Europe alone it killed an estimated 30 to 60 per cent of the population in just a few years. It was one of the deadliest disasters in human history, and it changed the economy, society and religious life of the late Middle Ages.

Origins and spread

The disease was caused by the bacterium Yersinia pestis. Historians and scientists have long believed it emerged in Central Asia, and a 2022 genetic study of graves in present-day Kyrgyzstan pointed to an outbreak there in the late 1330s. Plague was not new to Europe and the Mediterranean: the Plague of Justinian, which began in 541, had been caused by the same bacterium, but the disease had then been absent from Europe for several centuries.

The plague moved west along trade routes. In 1346 it struck the army of the Golden Horde, a Mongol state, while it was besieging the Genoese trading port of Caffa (modern Feodosia) in Crimea. A later Italian account claims the besiegers threw infected corpses over the walls, but historians treat this story with caution.

Genoese ships carried the disease into the Mediterranean. In October 1347 it reached Messina in Sicily, and by the end of that year it had arrived in Constantinople, Alexandria and Marseille. In 1348 it spread through Italy, France, Spain, England and Ireland; in 1349 it reached much of Germany, the Low Countries and Scandinavia; and by 1351–1353 it had arrived in Russia.

The pattern followed the routes of trade and travel. Plague usually reached a region by sea, struck the ports first and then moved inland along rivers and roads. It arrived in England through a port in Dorset, usually identified as Melcombe (now part of Weymouth), around June 1348, and reached London by the autumn. In the Islamic world it struck Cairo, Damascus and other great cities in 1348–1349; the historian al-Maqrizi later described Cairo’s streets emptied by the dead.

Some places seem to have suffered less than others, and a few cities, such as Milan, are said to have escaped lightly thanks to harsh measures against the first cases. Such claims are hard to test, because records are patchy, and historians continue to debate regional death rates.

How the plague killed

Plague took several forms. In bubonic plague, the most common, bacteria passed into the body through flea bites and caused painful swellings called buboes in the groin, armpits or neck. Many victims died within a week. Pneumonic plague infected the lungs, could spread from person to person through coughing, and was almost always fatal. Septicaemic plague infected the blood directly.

The traditional explanation is that the disease was spread by fleas living on black rats. Some researchers argue that human fleas and lice also played a major role, which would help explain how quickly it moved through towns. In 2011, DNA taken from victims buried in a 14th-century cemetery at East Smithfield in London confirmed that Yersinia pestis was the cause.

Medieval doctors did not know about bacteria. Many blamed corrupted air, known as miasma, or an unlucky alignment of the planets. Remedies such as bloodletting and aromatic herbs did little to help. In 1348 the medical faculty of the University of Paris, asked by the French king for an explanation, blamed a conjunction of Saturn, Jupiter and Mars in 1345 that had supposedly corrupted the air. Many people also saw the disaster as a punishment from God for human sin.

Life during the pandemic

Contemporary writers describe a world turned upside down. In the introduction to his Decameron, the Florentine writer Giovanni Boccaccio described the plague in Florence in 1348: the sick abandoned by their families, the dead piled into mass graves and normal social life collapsing. The traveller Ibn Battuta witnessed the epidemic in Damascus and other cities of the Middle East. In Siena, the chronicler Agnolo di Tura wrote that he had buried his own five children with his own hands, and that so many were dying that people believed it was the end of the world.

The clergy, who cared for the sick and the dying, suffered especially heavy losses. Some parishes lost priest after priest, and the Church had to ordain new clergy quickly, often younger and less well trained. Ordinary routines broke down: harvests went ungathered, courts closed and trade was disrupted.

Fear produced violent reactions. Groups of flagellants walked from town to town whipping themselves as penance for the sins they believed had caused the disaster. In many places Jewish communities were falsely accused of poisoning wells and were attacked and murdered, including in Strasbourg in February 1349. Pope Clement VI, then based at Avignon, issued papal bulls in 1348 condemning these attacks and pointing out that Jews were dying of the plague as well. His physician Guy de Chauliac later wrote a detailed description of the disease. Clement also condemned the flagellant movement in 1349, fearing it had slipped beyond the control of the Church.

Despite the papal protection, the persecution of Jews was one of the darkest episodes of the pandemic. Accusations were often extracted under torture, and hundreds of Jewish communities in the Holy Roman Empire, from Switzerland to the Rhineland, were destroyed in 1348–1351. Many survivors moved east, especially to Poland, where they found greater security in the following centuries.

Aftermath and consequences

With so many dead, there were far fewer people to work the land. Surviving labourers began to demand higher wages, and landowners and governments tried to stop them. In England, the Ordinance of Labourers (1349) and the Statute of Labourers (1351) attempted to hold wages at pre-plague levels. Tensions over wages, taxes and labour duties fed later unrest, including the Jacquerie in France in 1358 and the Peasants’ Revolt in England in 1381.

Over the long term, many historians argue that the shortage of labour helped weaken serfdom in western Europe and raised living standards for some survivors. The disaster also influenced art, with images of death and the “dance of death” becoming more common in later centuries. Some wealthy people commissioned tombs showing their own decaying corpses beneath their effigies, a stark reminder of mortality.

For survivors, there was more land per person, and peasants who could move to better-paid work or cheaper rents often did so. Diets for many ordinary people improved in the late 14th and 15th centuries, with more meat and ale, although this varied greatly by region.

Plague did not disappear. It returned in waves for more than 300 years, including the Great Plague of London in 1665, which came just before the Great Fire of London. Repeated outbreaks, beginning with a second wave in the early 1360s, kept Europe’s population low; in many regions it did not recover its pre-1347 level until the 16th century.

Cities developed new public health measures. In 1348 Venice and Florence appointed temporary officials to oversee burials and sanitation, and later Italian cities created permanent health boards. In 1377 Ragusa (modern Dubrovnik) required arrivals from infected areas to wait in isolation for 30 days, a practice that was later extended to 40 days and became known as quarantine, from the Italian quaranta, “forty”.

Myths and facts

Myth: plague doctors in beaked masks treated victims of the Black Death. The familiar beaked mask and long waxed coat date from the 17th century, about 300 years later. Physicians in the 1340s wore ordinary clothing.

Myth: the nursery rhyme “Ring a Ring o’ Roses” is about the Black Death. The rhyme is first recorded in the 19th century, and the plague interpretation appeared only in the 20th. Folklorists generally reject the link.

Myth: medieval people did nothing to fight the plague. They lacked any understanding of germs, but many towns isolated the sick, regulated burials, cleaned streets and restricted travel and trade. These measures were the beginnings of organised public health.

By the numbers

Timeline

• Late 1330s: Plague is present in Central Asia, according to recent genetic and archaeological research.
• 1346: Plague breaks out among the Golden Horde army besieging Caffa in Crimea.
• 1347, October: Genoese ships bring the plague to Messina, Sicily.
• 1348: The plague spreads through Italy, France, Spain, England and Ireland; Boccaccio witnesses it in Florence.
• 1349: It reaches much of Germany, the Low Countries and Scandinavia; Jewish communities are massacred in Strasbourg and elsewhere.
• 1351: England passes the Statute of Labourers to control wages.
• 1351–1353: The pandemic reaches Russia and gradually subsides in Europe.

Why it matters

The Black Death was a demographic catastrophe on a scale Europe has never seen since. It reshaped work, wealth and belief, left deep scars on religious minorities, and gave rise to some of the first organised public health measures. It remains a key reference point for understanding pandemics today.