A 14th-century siege launched the deadliest pandemic in human history
In 1346, the Mongol-led Golden Horde laid siege to the Genoese trading port of Caffa on the Crimean Peninsula. When plague struck the attacking army, their commander ordered diseased corpses catapulted over Caffa's fortified walls. Terrified Genoese defenders retreated onto merchant ships bound for Italy, inadvertently ferrying the Black Death across the Mediterranean. Within five years, the pandemic wiped out an estimated one-third to one-half of Europe's entire population.
The Crimean Outpost and the Golden Horde
In the mid-fourteenth century, the Crimean port of Caffa—situated on the northern coast of the Black Sea—served as one of the most vital trading hubs connecting Europe to Asian commercial networks. Established by the Republic of Genoa under agreements with the Mongol rulers of the Golden Horde, the fortified city operated as an emporium where silk, spices, grain, and enslaved people were bought and sold. The Pax Mongolica had long facilitated safe passage for merchants across Eurasia, allowing Italian maritime republics to prosper in distant territories. However, this commercial coexistence was inherently fragile, resting on shifting alliances and local political balances.
Relations between Italian merchants and the local Muslim population deteriorated sharply in 1343 following an altercation in the nearby trading town of Tana, situated near the mouth of the Don River. After an Italian merchant killed a local Muslim during a dispute, hostilities erupted rapidly. The Venetian and Genoese residents fled Tana and took refuge inside the formidable fortifications of Caffa. Jani Beg, who had recently assumed control of the Golden Horde, mobilized an army to punish the Italian enclave and bring the fortified harbor under his direct control, beginning a protracted confrontation.
The Siege and the Assault of the Dead
The first Mongol siege of Caffa was abandoned in 1344 after Italian forces mounted a staunch defense and inflicted heavy casualties on the attackers. Undeterred, Khan Jani Beg reconstituted his forces and returned in 1345 to invest the port once again. Caffa's access to the sea made it nearly impossible to starve completely, as Genoese ships regularly ran the blockade to bring supplies and reinforcements. Cut off from an easy land conquest, the Mongol forces settled into a grueling siege that dragged into 1346, keeping the defenders trapped within their inner perimeter.