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Scientists Discover Cause of the World’s First Recorded Pandemic: The Justinian Plague Solved

by Web Desk
August 30, 2025
in Technology
Scientists Discover Cause of the World’s First Recorded Pandemic: The Justinian Plague Solved
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For centuries, historians, archaeologists, and scientists have debated the origins of the world’s first recorded pandemic, which devastated the eastern Mediterranean over 1,500 years ago. Now, a breakthrough study has finally provided definitive proof. Scientists have successfully sequenced the genome of the bacterium Yersinia pestis—the same pathogen responsible for the infamous Black Death—from human remains in a mass grave in Jerash, Jordan.

The findings, published in the journal Genes, confirm that the Justinian Plague (541–750 AD) was indeed caused by Yersinia pestis. This discovery not only solves a long-standing historical mystery but also deepens our understanding of how pandemics shaped civilizations.


The Discovery: Ancient DNA Reveals the Culprit

Researchers examining a mass grave in the ancient Greco-Roman city of Jerash, Jordan, unearthed skeletal remains belonging to victims of the pandemic. Using advanced DNA sequencing technologies, they successfully extracted fragments of genetic material that matched Yersinia pestis, the bacterial agent of plague.

This evidence confirms what many historians suspected but could not prove: the Justinian Plague was caused by the same microbe that later fueled the Black Death in the 14th century and several other devastating outbreaks throughout history.

According to the researchers, this breakthrough provides the first direct genetic evidence of plague from the early Byzantine era.


What Was the Justinian Plague?

The Justinian Plague was one of history’s most catastrophic health crises. It first appeared in 541 AD during the reign of Byzantine Emperor Justinian I, sweeping through the empire’s capital, Constantinople, and rapidly spreading across the Mediterranean and beyond.

Timeline of the Outbreak:

  • 541 AD: The plague first emerges in Egypt, likely carried through Red Sea trade routes.
  • 542 AD: Constantinople experiences a massive outbreak, with tens of thousands dying each week.
  • 541–750 AD: The pandemic continues in waves for over 200 years, killing millions across Europe, the Middle East, and North Africa.

Historians estimate that the plague may have killed 30–50 million people, roughly half of the Mediterranean’s population at the time.


Symptoms and Spread of the Disease

Based on ancient accounts, victims of the Justinian Plague experienced symptoms similar to later plague outbreaks:

  • High fever and chills
  • Painful swollen lymph nodes (buboes)
  • Delirium and confusion
  • Rapid death within days of infection

The disease is believed to have been transmitted by fleas carried by black rats, which thrived in urban centers and along trade routes. Ships carrying grain across the Mediterranean likely played a central role in spreading the plague from Egypt to Constantinople and beyond.


Impact on the Byzantine Empire

The Justinian Plague reshaped history. Emperor Justinian I had ambitious plans to reconquer lost Roman territories in the West, but the outbreak severely weakened his empire.

Key Consequences:

  1. Demographic Collapse: With millions dead, entire villages and farmlands were abandoned, leading to food shortages.
  2. Economic Disruption: Tax revenues plummeted, trade slowed, and the Byzantine economy shrank dramatically.
  3. Military Decline: Manpower shortages weakened the empire’s armies, limiting expansion and leaving borders vulnerable.
  4. Political Instability: Public anger against Justinian grew, as many blamed him and his policies for failing to contain the plague.

Some historians argue that the Justinian Plague changed the course of European history, paving the way for the rise of Islam in the 7th century and delaying Europe’s recovery for centuries.


A Long-Standing Mystery Finally Solved

For decades, scholars debated whether the Justinian Plague was truly caused by Yersinia pestis, as suggested by historical descriptions, or by some other pathogen such as smallpox, typhus, or anthrax.

While written sources described bubonic symptoms, physical evidence was lacking. Previous attempts to detect plague DNA from this era yielded inconclusive results.

This new study from Jerash finally closes the debate by providing concrete genomic evidence, directly linking the first pandemic to the plague bacterium.


The Role of Jerash in the Discovery

Jerash, located in present-day Jordan, was once a thriving Greco-Roman city known for its colonnaded streets, theaters, and temples. Archaeological excavations uncovered a mass burial site, unusual for the period, suggesting a sudden catastrophic event.

The victims’ remains provided scientists with an unprecedented opportunity to test for pathogens. Advanced techniques in ancient DNA extraction and sequencing allowed researchers to recover and reconstruct the plague bacterium’s genome.

This not only proved Yersinia pestis was responsible but also gave insights into how the strain compared to later pandemics.


Comparing Justinian Plague with the Black Death

Both the Justinian Plague and the Black Death were caused by Yersinia pestis, but genetic analysis reveals differences between the strains.

  • Justinian Strain: An early lineage of Y. pestis that has since gone extinct.
  • Black Death Strain: Evolved later, spreading in the 14th century and killing an estimated 75–200 million people.

Despite genetic differences, the mechanism of spread—via fleas and rats—remained the same, underlining the recurring vulnerability of human societies to zoonotic diseases.


Lessons for Modern Pandemics

The discovery of Yersinia pestis in ancient graves carries important lessons for modern society.

  1. Pandemics are Recurrent: History shows that pandemics are not new; societies have faced them repeatedly across centuries.
  2. Global Connectivity Spreads Disease: Just as ancient trade routes spread the plague, modern global travel accelerates outbreaks.
  3. Importance of Science: Advances in genomics and archaeology are crucial for uncovering past pandemics and preparing for future ones.
  4. Economic and Political Impact: Pandemics reshape societies, economies, and empires—just as COVID-19 has shown in the 21st century.

Expert Opinions on the Breakthrough

  • Dr. Marcel Keller, ancient DNA expert: “This is groundbreaking evidence that finally confirms the Justinian Plague was indeed plague. It resolves a debate that has lingered for decades.”
  • Dr. Monica Green, medical historian: “The discovery emphasizes the continuity of plague throughout human history and highlights the interconnectedness of ancient and medieval pandemics.”
  • Archaeologist team in Jerash: “The mass grave at Jerash is a time capsule of one of history’s darkest moments. It has given science the key to unlock a 1,500-year-old mystery.”

The Continuing Legacy of Yersinia pestis

Although the Justinian strain has disappeared, Yersinia pestis is not extinct. The bacterium still exists in animal reservoirs, particularly in rodents, and small outbreaks of plague continue to occur in parts of Africa, Asia, and even the western United States.

Modern antibiotics can treat plague if diagnosed early, but the persistence of the pathogen underscores the ever-present threat of infectious diseases.


Conclusion

The confirmation that the Justinian Plague was caused by Yersinia pestis marks a milestone in the study of ancient pandemics. By sequencing DNA from remains in Jerash, Jordan, scientists have solved a mystery that puzzled historians for centuries.

This discovery not only clarifies the origins of the world’s first recorded pandemic but also reinforces the profound impact of disease on the fate of empires and civilizations.

As humanity continues to grapple with modern outbreaks, from COVID-19 to emerging zoonotic diseases, the lessons of the past remain more relevant than ever: pandemics shape history, and science is our best defense.

Read more:….

Tags: internationalNationalsocial mediatime line newsUniversity
Web Desk

Web Desk

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