The Black Death: Mapping the Deadliest Pandemic in History

The Plague That Changed Everything

In 1346, the Mongol army besieging the Genoese trading post of Kaffa in Crimea catapulted plague-ridden corpses over the city walls. Whether or not this was the actual vector, within months the disease had reached the ships in Kaffa's harbor. Those ships carried it to Constantinople, Sicily, and the ports of the Mediterranean. What followed was the most lethal pandemic in recorded history: the Black Death, which killed an estimated 25 to 50 million people — roughly 30 to 60 percent of Europe's entire population.

This map visualizes the plague's terrifying speed of transmission. Starting from a single point in Crimea, you can watch the disease engulf the known world in just seven years.

From Crimea to Constantinople

The plague traveled along the trade routes that connected the Mongol Empire to the Mediterranean world. By June 1347, it had reached Constantinople — the crossroads of Europe and Asia — and the eastern Mediterranean. The great commercial networks that had brought prosperity to medieval Europe now became highways of death. Every ship that docked, every caravan that arrived, carried the potential for catastrophe.

The Mediterranean Engulfed

By October 1347, Genoese galleys had brought the plague to Sicily and southern Italy. The disease spread with terrifying speed through the densely populated Italian city-states. By January 1348, it had reached northern Italy, the great port of Marseille, and the coast of North Africa. The pattern was always the same: the plague arrived by sea, established itself in port cities, and then radiated outward along roads and rivers into the interior.

Across the Continent

Through 1348 and 1349, the plague swept through France, the Iberian Peninsula, England, the Holy Roman Empire, and Scandinavia. Some regions lost half their population in a matter of months. Entire villages were abandoned. The social fabric of medieval Europe was torn apart: labor shortages transformed the feudal economy, religious movements swung between desperate piety and nihilistic excess, and Jewish communities were scapegoated in horrific pogroms across central Europe.

By 1353, the first wave had reached Moscow, completing its sweep across the known world. But the Black Death was not a one-time event — it returned in waves throughout the 14th and 15th centuries, keeping population levels depressed for generations.

Spread Timeline

• 1346, June — Siege of Kaffa in Crimea; plague enters Golden Horde trade networks
• 1347, June — Constantinople and the eastern Mediterranean infected
• 1347, October — Genoese ships bring plague to Sicily and southern Italy
• 1348, January — Northern Italy, Marseille, and North Africa reached
• 1348, mid-year — France, Iberian Peninsula, and England engulfed
• 1349 — Holy Roman Empire, Scandinavia, and eastern Europe affected
• 1350–1351 — Plague reaches Scotland, Poland, and the Baltic
• 1353 — First wave reaches Moscow; initial pandemic subsides