Societal and Political Upheaval Caused by the Plague

Key Insight

The Black Death triggered an unparalleled demographic catastrophe, drastically reducing the world's population between 1340 and 1400. Africa's population declined from 80000000 to 68000000, and Asia's from 238000000 to 201000000. Globally, the total population, excluding the Americas where the plague arrived centuries later, plummeted from approximately 450000000 to between 350000000 and 375000000, representing a net loss of at least 75000000 people, or over 1000000 deaths annually for the remainder of the fourteenth century. Europe alone experienced a decline from around 75000000 to 52000000, with a death toll of approximately 25000000, which accounted for between a third and one-half of its total population. These losses far surpassed the devastation of World War II in Europe, where Great Britain lost less than 1 percent, France 1.5 percent, Germany 9.1 percent, and even famine-stricken Poland and Ukraine reached only around 19 percent. This decimation effectively shattered the social order that had prevailed in Europe since the fall of Rome, plunging the continent into dangerous disorder.

The plague disproportionately affected urban dwellers, leading to the destruction of the educated class and skilled craftsmen. Within cities and in the confined, unsanitary conditions of monasteries and convents, the disease found fertile ground, causing widespread mortality from which European monasticism and the Roman Catholic Church struggled to recover. Dense villages, castles, and manorial estates faced similar threats. While most cities grappled with ineffective measures like ringing or banning bells, Milan implemented a drastic but effective strategy: immediately sealing up any house where the plague broke out, trapping everyone inside, both sick and well. The profound social impact was vividly documented by Giovanni Boccaccio in his 'Decameron', recounting how in Florence during 1348, family bonds dissolved, with husbands deserting wives and mothers abandoning children to escape the disease. Priests were overwhelmed, unable to perform services, and diggers could not cope with the sheer volume of bodies, which were often cast into mass graves or left for animals. Boccaccio observed that 'the venerable authority of laws, human and divine, was abased and all but totally dissolved,' and 'every man was free to do what was right in his own eyes.'

Lacking an understanding of the plague's true cause, people quickly associated its spread with commerce and the movement of individuals. Responses varied from abandoning cities to imposing strict closures, both severely halting trade, communication, and transportation. Throughout Europe, local authorities enacted plague laws; for instance, in 1348, Pistoia in Tuscany banned entry from infected areas, prohibited the import of used textiles, and forbade the sale of fruit or slaughter of animals that might create the 'smell of death,' which they mistakenly linked to disease transmission. The tanning trade also ceased, stopping leather commerce, and returning citizens were limited to 30 pounds of baggage. Gifts or visits to plague-stricken homes were forbidden, as was buying new clothing. Diplomatic exchanges ceased, and the Catholic Church lost contact with its missions in China. Fear fueled xenophobia, leading people to blame foreigners for the disease. In Europe, Christians revived persecutions against Jews, who were associated with commerce and the East. Jews were locked in their homes and burned, or tortured into false confessions. Despite Pope Clement VI's papal bull in July 1348 to protect Jews, persecutions escalated, exemplified by the mass burning of 2000 Jews in Strasbourg on Valentine's Day 1349. Similar persecutions targeted the Muslim minority in Christian Spain, driving many to seek refuge in Granada and Morocco. The plague not only isolated Europe but also severed the Mongols in Persia and Russia from China and Mongolia, disrupting their interconnected ownership system and depriving the Mongol Golden Family of vital trade and tribute, thereby undermining their primary source of support.