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Black Death
1346–1353· Event· Global
Well documentedSolid records, physical evidence or scientific consensus.
A plague pandemic that swept from Central Asia across the Middle East and Europe, killing perhaps a third to half of Europeans.
See it on the History map →What happened
The bacterium Yersinia pestis, carried by fleas on rats and possibly spread between people, reached the Black Sea ports of Crimea by 1346. Genoese ships carried it to Sicily in 1347, and within four years it crossed Europe and struck Egypt and the Middle East. Estimates of deaths vary, often 25–50 million in Europe alone. Survivors faced labor shortages; wages rose and peasants rebelled. In panic, mobs massacred Jewish communities falsely blamed for the disease.
Why it matters
By making labor scarce and valuable, it weakened serfdom in western Europe, and it shook faith in the Church and other old institutions.
Think of it like
Like a market where half the tenants vanish overnight: rents fall, and bargaining power shifts to whoever remains.
How we know
Chronicles, tax and parish records; mass graves in London and elsewhere; ancient DNA from victims' teeth confirming Yersinia pestis, including 1338–39 graves in Kyrgyzstan.
Still debated
How it spread so fast (rat fleas, human fleas and lice, or person to person through the lungs) and its true toll outside Europe are still debated.
Connections (3)
▸Silk Road later helped carry Black DeathMostly agreed
The connection
The caravan routes that had linked China, Central Asia and the Mediterranean for centuries also carried rats, fleas and infected people. The plague seems to have broken out in Central Asia in the late 1330s, then moved west with traders to the Black Sea, where Italian ships picked it up.
When and how
Central Asia, around 1338; Caffa in Crimea, a Genoese trading port, by 1346; Messina in Sicily, October 1347.
How sure are we?
Ancient DNA from 1338–39 graves near Lake Issyk-Kul in Kyrgyzstan, on a trade route, matches the Black Death strain; chronicles trace its westward spread.
Debates and open questions
Whether it spread mainly by caravans, by armies, or by rodents moving between wild colonies is debated; its path into China is unclear.
▸Mongol Empire (Genghis Khan) unified the trade routes that spread the Black DeathMostly agreed
The connection
By uniting most of Eurasia, the Mongols made long-distance travel safer and busier, so goods, people, rats and fleas moved farther and faster. In 1346 an army of the Golden Horde, a Mongol successor state, besieged the Genoese port of Caffa in Crimea while plague raged in its camp. Ships leaving Caffa helped carry it to the Mediterranean.
When and how
The Mongol trade network across Central Asia, 1330s–1340s; the siege of Caffa in 1346 by Jani Beg, khan of the Golden Horde.
How sure are we?
Ancient DNA tracing the plague strain to Central Asia; Gabriele de' Mussi's account of Caffa; chronicles showing plague following trade routes.
Debates and open questions
De' Mussi's story that the Mongols catapulted corpses into Caffa is famous but unconfirmed; he was not there, and rats could explain the spread.
▸Black Death may have helped spark The RenaissanceDebated
The connection
One argument: by killing so many, the plague raised survivors' wages and concentrated inheritances, so some families had more money for art and learning. It also shook trust in old institutions and focused minds on death and lasting fame. Critics note that Italy's cultural revival began before 1348, and that the plague also caused deep economic slumps.
When and how
Italy, especially Florence and Siena, after 1348; Florence may have lost about half its people.
How sure are we?
This link is an interpretation, not a record. It rests on wage, rent and tax data showing richer survivors, and on the timing of Florence's cultural boom after 1400.
Debates and open questions
Historians disagree: some see the plague as a cause, others as a setback that delayed a revival already under way with Giotto and Petrarch before 1348.