In 1347, a Genoese trading ship arrived in the port of Messina, Sicily. The sailors aboard were dying, covered in black boils that oozed blood and pus. The ship was ordered out of the harbor, but it was too late. The Black Death (Bubonic Plague) had arrived in Europe. Within three years, it is estimated that between 30% and 60% of the entire population of Europe was dead. It was the greatest catastrophe in human history. For the Lords and Ladies living in their stone fortresses, the castle transformed from a military bunker into a quarantine island. They pulled up the drawbridges and waited for the apocalypse to pass.
The Castle as Quarantine
Castles were seemingly the perfect places to hide. Wealthy nobles fled the cities (which were death traps of cramping and poor sanitation) for their country estates. This is the exact setting of Giovanni Boccaccio’s famous book The Decameron—a group of rich young people hiding in a villa outside Florence, telling stories to amuse themselves while the world burns outside. Did it work? Sometimes.
- Isolation: Castles were self-sufficient. They had their own wells, granaries, livestock (often brought inside the walls), and gardens. A well-stocked castle could seal itself off for months.
- The Fatal Flaw (The Rat): The plague was carried by the bacteria Yersinia pestis, which lived in fleas, which lived on black rats. Castles are full of food stores. Rats can climb rough stone walls. They can swim moats. They can crawl through drainage pipes and garderobe chutes. No matter how high the walls or how tight the guard, the rats got in. And once the fleas hopped from a dead rat to a human, the castle became a tomb.
Miasma and “Bad Air”
Medieval doctors didn’t know about bacteria or viruses. They believed in Miasma Theory—the idea that disease was spread by “bad air,” foul smells, or corrupt breezes. To fight the plague, they engaged in chemical warfare against the smell:
- Sweet Herbs: Floors were covered in lavender, rosemary, and sage. Bouquets of flowers were placed in every window.
- Fire: Huge bonfires were lit in the castle courtyards to “purify” the air. Sometimes aromatic woods like pine or juniper were burned.
- Perfume: People carried pomanders—balls of ambergris, musk, and herbs—to sniff whenever they encountered a bad smell. Ironically, this might have helped slightly—not because it cleaned the air, but because strong scents (like lavender) are natural insect repellents. By soaking themselves in essential oils, the rich may have discouraged the fleas from biting them.
The Plague Doctor: The Bird of Death
The most terrifying sight you could see from the castle walls was the silhouette of a Plague Doctor. The iconic costume (which actually became standardized later, in the 17th century by Charles de Lorme) was an early form of Hazmat suit.
- The Mask: A beak-shaped mask. The beak wasn’t for scary effect; it was filled with theriac (a compound of 55 herbs), dried flowers, camphor, and spices. It acted as a gas mask to filter the “miasma.”
- The Coat: A long, heavy leather or waxed canvas coat. The wax prevented bodily fluids (blood/pus) from soaking through to the skin.
- The Cane: Doctors carried a long wooden cane to examine patients, lift their clothes, or take a pulse without ever touching them physically. Their treatments were brutal and mostly useless. They included lancing the buboes (boils), bloodletting (which weakened the patient), or applying live toads or pigeons to the sores to “draw out the poison.”
The Flagellants
As the plague raged, religious hysteria took hold. People believed God was punishing humanity for its sins. Processions of Flagellants wandered the countryside. These were men who walked from town to town, whipping themselves with scourges (whips with knotted cords and metal spikes) until their blood flowed, singing hymns and begging for forgiveness. Castles would often lock their gates against them. not just because they were socially disruptive, but because a wandering group of bleeding men was a perfect vector for spreading the disease further.
Case Study: The Village of Eyam
While not a castle, the story of Eyam in Derbyshire (1665) is the ultimate example of medieval quarantine logic. When plague arrived in the village (via a bundle of cloth from London), the villagers, led by their vicar, made a heroic pact. Instead of fleeing and spreading the disease to the nearby towns, they quarantined themselves. They drew a “cordon sanitaire” around the village. No one went in, no one came out. They paid a terrible price. 260 of the 350 residents died. But the plague did not spread to the north. They sacrificed themselves to save the region.
The Social Collapse and the Rise of Labor
The Black Death killed the feudal system even faster than gunpowder did. Before the plague, peasants (Serfs) were tied to the land. They worked for the Lord for free in exchange for protection.
- Labor Shortage: Suddenly, 50% of the workforce was dead. Crops were rotting in the fields.
- Supply and Demand: The surviving peasants realized their value. They refused to work for free. They demanded wages. If a Lord refused, they simply walked to the next castle, where the desperate Lord would pay them.
- The Middle Class: This shift created the first real wage-earning class in Europe. The “Golden Age of the Peasant” followed, with better diet and higher wages than ever before. The castle Lord was no longer an absolute master; he was an employer.
Ring a Ring o’ Roses
We still sing about the plague today. The nursery rhyme “Ring a Ring o’ Roses” is widely believed (though folklorists debate this) to be about the Black Death:
- “Ring a Ring o’ Roses” (The red, ring-shaped rash that appeared on the skin).
- “A pocket full of posies” (The herbs carried to ward off the smell).
- “Atishoo! Atishoo!” (The sneezing that was a final symptom of the pneumonic plague).
- “We all fall down” (Death).
Conclusion
A castle could stop an army of knights, but it couldn’t stop a flea. The Black Death proved that stone walls are no defense against biology. Walking through the empty halls of a castle today, it is chilling to imagine the families huddled inside 700 years ago, listening to the death carts rolling by outside, praying that the scratching sound in the wall was just the wind, and not a rat.