Immunology and geography converge in studies of pandemic policies
Updated: Sep 22
How the Black Death redefined government authority in England and Italy.
The Black Death, also known as the bubonic plague, was one of the most devastating pandemics in world history. Originating from the steppes of Central Asia and carried by infected fleas on rats, the deadly bacterium Yersinia pestis spread rapidly along maritime and overland trade routes throughout Afro-Eurasia in the fourteenth century.

The largest outbreak struck Europe between 1347 and 1352, wiping out 30-60% of the continent’s population. The resulting economic and political turmoil triggered inflation, labor shortages, and loss of faith in well-established institutions, from the church to the monarchy. To halt the plague and restore order, European governments responded with distinct regulations to consolidate their power, leading to labor revolts that eroded the feudal system in England and a centralized bureaucracy that implemented stringent public health policies in Italy.

In England, the labor legislation in response to the pandemic fueled social unrest that irreversibly weakened the medieval feudal system. The plague killed 30-40% of England’s population and left only 10-20% of inhabitants alive in some villages. Farmers, who already suffered from malnutrition from the previous famine, comprised a significant portion of the staggering death toll, leaving more unoccupied land and fewer tenants. Labor shortages gave surviving peasants stronger bargaining power over lords since the latter now had to compete for employees to cultivate their estates. As a result, wages doubled, and rent fell from half of the harvested crop to a seventh or eighth, drastically reducing the nobles’ revenue. Farmers also secured better working conditions, such as free farm tools. More importantly, demands for freedom to work elsewhere for better treatment threatened the lords’ authority to exploit their subjects. To protect the nobles and preserve social order, King Edward III issued the Ordinance of Labourers in 1349, which fixed wages at their pre-plague levels, required all healthy men under sixty to work, and forbade them from receiving charitable gifts. The 1351 Statute of Labourers further capped wages for many occupations, from masons to carpenters, and controlled prices at which tradespeople such as butchers and bakers sold their goods and services.

King Edward III depicted in the 16th century.
Source: Royal Collection of the United Kingdom via Picryl.com

However, such labor laws, which the Michigan Law Review described as “the most comprehensive governmental regulation of English society in the era,” only intensified class conflict. In 1381, dissent against the government’s excessive intervention culminated in a peasant revolt. Wat Tyler led the rebels from Kent to London, where they burnt public buildings and forced King Richard III to pledge to abolish serfdom and phase out the feudal system. Though the king defaulted on his promises and crushed the rebellion as violence ensued, the movement marked a pivotal moment of the peasants’ political agency. The struggle between them and the ruling class would continue until stability returned and the economy recovered in the 1390s. Nevertheless, an assertive and mobile peasant class had already subverted the traditional feudal hierarchy. England thus transformed into a more mature legal system after the Black Death.

In contrast, Italy adopted a more centralized style of governance by experimenting with strict public health policies to control people’s private lives during the Black Death. Without a ruling monarchy like England, Italy was a collection of city-states governed independently by elected leaders or elite families. Many Italian cities occupied strategic locations as maritime trading hubs, making them among the first to experience plague. Dense populations and heightened commercial activity allowed disease to spread quickly and caused exorbitant death tolls. In Florence alone, 96,000 died from March to October in 1348, leaving a remaining population of only 50,000. In the chronicler Baldassarre de Buonaiuti's account, “None of the guilds in Florence was working. All the shops were shut, taverns closed,” and “no one seemed to know what to do.”

As the economy collapsed and officials and citizens alike died or fled, traditional governance ceased to function. In response, governments resolved to take unprecedented measures to prevent plague and restore order. Venice, in particular, closed trade routes, introduced Europe’s earliest official quarantine procedures in 1348, and elected three savi, or “sages,” to manage the pandemic. Pistoia, a smaller city in Tuscany, enforced health ordinances, setting clear standards for public hygiene and quarantine practices, and banned activities deemed unclean. For instance, one law inflicted a 200 pence penalty on anyone who “shall dare or presume to bring… any old linen or woolen clothes”. In Florence, Buonaiuti detailed even more specific laws, such as banning fruits from entering the city and reducing friars in local churches to cut costs. The governments therefore micromanage citizens' daily lives instead of passively administering justice. In other words, the government now had an absolute say over factors such as what volume of trade may occur and who underwent quarantine while others roamed free in the name of public welfare. The policies not only allowed most city-states to rebound in population and prosperity but also provided a model for the government’s unquestioned role during times of crisis.
The Black Death’s widespread destruction proved itself a significant economic and political force that redefined the role of government in Europe. Although both governments increased their absolute authority, English monarchy set labor laws affecting millions of workers and only relented when its subjects rebelled, while in Italy, never had public authorities meddled more in the lives of its citizens than when they sought to contain the pandemic. In both cases, however, the Black Death would permanently alter the economic involvement and political identities of European societies, whether it be the end of feudalism or the rise of bureaucratic institutions.
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