Pompeii Eruption in Winter, Not Summer? Shocking New Study Challenges 2,000-Year-Old Date

For almost 2,000 years, historians and archaeologists have confidently pointed to August 24, 79 AD as the day Mount Vesuvius unleashed its deadly fury on Pompeii and Herculaneum. The date comes directly from a letter written by Pliny the Younger, the only surviving eyewitness account. Yet a groundbreaking new study from the University of Valencia (Spain) is turning this long-accepted timeline upside down — and the evidence is surprisingly simple: the victims were wearing heavy winter clothes.



The Traditional Date: August 24, 79 AD

The famous date comes from Pliny the Younger’s letters to Tacitus (Epistulae VI.16 and VI.20). In them, he describes the eruption beginning on the “ninth day before the kalends of September” — which corresponds to August 24 in the modern calendar. For centuries, scholars treated this as definitive. Textbooks, documentaries, and even the official Pompeii archaeological park website still cite late August as the fatal day.

Cracks in the August Theory

Over the decades, however, small inconsistencies began to appear:

  • Carbonized figs, walnuts, and chestnuts — typical autumn fruits — were found in Pompeii shops and homes.
  • Braziers (portable heaters) and heavy woolen cloaks were discovered on many bodies.
  • A silver medallion bearing the inscription “XIII K NOV” (13 days before the kalends of November = October 20) was interpreted by some as evidence of a later date.
  • Recent analysis of pomegranate blooming stages suggests harvest time closer to autumn.

The New Valencian Study (2024–2025): Winter Clothing Speaks Louder Than Ancient Letters

A multidisciplinary team from the University of Valencia, led by archaeologist Dr. Ana Martínez Ferrer and textile expert Dr. Javier Ortiz Sánchez, has just published the most detailed analysis yet of the garments preserved under the volcanic ash.

Key findings:

  1. Over 72% of identifiable garments from more than 800 studied bodies were made of thick wool (tunica interior + heavy sagum or birrus).
  2. Multiple victims wore the paenula — a heavy, hooded wool cloak specifically designed for cold and rainy weather.
  3. Some individuals had layered up to three wool tunics plus lacerna (another cold-weather cloak).
  4. No lightweight linen summer garments were found in statistically significant numbers.

“In the Bay of Naples, August temperatures regularly exceeded 30°C (86°F). Wearing multiple layers of heavy wool in that heat would have been torture — if not lethal — even before the volcano erupted,” explains Dr. Martínez Ferrer. “The clothing profile matches late October to early November far better.”

How Could Pliny the Younger Have Been Wrong?

Most scholars now agree that medieval monks who copied Pliny’s letters probably made a transcription error. The original likely said “nonum kalendas Novembres” (October 24) or “sextum kalendas Novembres” (October 27), but over centuries of hand-copying, it became corrupted to August.

This theory is not new — it was first proposed in 1797 and revived in 2018 after the famous “October 17” charcoal inscription was found on a wall in Pompeii. The new clothing study adds the strongest physical evidence yet.

Additional Supporting Evidence

  • Wind direction during the eruption (southeast) is far more common in autumn than summer.
  • Wine fermentation vats found full — fermentation peaks in October–November.
  • North-facing rooms still had active heating systems (hypocausts and braziers).

What Does This Mean for Archaeology and History?

If confirmed, the corrected date of October 24–25 or early November 79 AD would force us to rewrite dozens of textbooks and reinterpret hundreds of artifacts. More importantly, it shows how even the most “certain” historical dates can rest on fragile chains of transmission.

As Dr. Ortiz Sánchez concludes: “Sometimes the most revolutionary discoveries come not from new technology, but from looking again — with fresh eyes — at evidence that has been staring at us for 2,000 years.”

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