Beyond the Books: How Historians Truly Know What Happened

On August 24, 79 AD, a Roman fleet commander sailed towards a cloud shaped like a pine tree. A 17-year-old boy, Pliny the Younger, watched him die as the city of Pompeii vanished. Historians know what that boy saw, hour by hour, thanks to two letters. Yet, these letters conceal a fundamental challenge: how do we truly know anything about the past? History is not a simple list of facts to memorize. It is a complex puzzle where every piece, from an eyewitness account to an archaeological find, must be rigorously tested to determine what really happened.

The Deception of Primary Sources

Many people assume that knowing history simply involves reading what someone wrote down at the time. This satisfying answer feels solid. For instance, the letters of Pliny the Younger describe the Pompeii eruption in vivid detail, claiming his uncle, Pliny the Elder, died on the beach at Stabiae on August 24. Similarly, the Bayeux Tapestry, a 230-foot embroidery stitched within 10 years of the 1066 Battle of Hastings, depicts Harold Godwinson swearing an oath and later dying with an arrow in his eye. These appear to be primary sources, offering direct proof of events.

However, historians do not simply collect facts. They test them using a method called source criticism, which asks two crucial questions about every surviving scrap: Is it real? And is it honest? This test splits into two parts: external criticism, which checks the object, and internal criticism, which checks the person or content.

Applying external criticism to Pliny’s letters reveals a problem. We do not possess the originals, only copies of copies. The August 24 date, widely memorized, comes from a medieval manuscript tradition that includes discrepancies. Some copies imply an autumn date, a detail supported by charcoal writing found at Pompeii in 2018 bearing an October date, and by fall fruit and heavy clothing found on bodies. The letters are real, but the precise date may be incorrect. History is not printed facts, but a chain of handwriting, prone to error.

Internal criticism examines who is speaking and why. Pliny was 17 miles away at Misenum, not at Stabiae, so he heard about his uncle’s death from others. The Bayeux Tapestry, though close to the event, was commissioned by Bishop Odo, William the Conqueror’s half-brother. The winners stitched it. Naturally, Harold is shown breaking an oath, and William appears lawful. This inherent bias challenges the notion of a perfectly objective primary source.

Leopold von Ranke, the Prussian scholar who invented modern source-based history, taught students to touch the paper, compare hands, and check ink, adhering to the simple rule: show what actually happened, not what should have. When historians apply this to the Battle of Hastings, they compare the Bayeux Tapestry with the Anglo-Saxon Chronicle, written by English monks near 1066, and William of Poitiers’ account, written by the Conqueror’s chaplain. While two agree Harold died fighting, none agree on how. The famous arrow in the eye may not be Harold at all, as the caption sits above two falling figures, one hit in the eye and one cut down by a sword. This gap in certainty is not failure. It is the method. History keeps what triangulates and marks what does not.

Cracking Ancient Codes: The Rosetta Stone

Sometimes, the paper lies in a different way, through unreadable language. The Rosetta Stone, found in Egypt in 1799, carried one decree written three times: in hieroglyphs, demotic, and Greek. The Greek could be read, but the hieroglyphs, a language dormant for millennia, could not. For 20 years, scholars made little progress, often guessing that each picture represented an idea, not a sound.

Then, Jean-François Champollion, a French linguist who had studied Coptics since age 10, broke the code in 1822. Before he turned 33, he proved that hieroglyphs mixed sound and meaning. He started with royal names, noting that the Greek name 'Ptolmy' in an oval on the stone corresponded to a similar oval of hieroglyphs. He did the same with 'Cleopatra' on the Philae obelisk, building an alphabet sound by sound. Once the sounds worked, a 3,000-year-old library of texts opened up. No eyewitness told him what the hieroglyphs meant. Instead, the stones corroborated each other; one script checked the other, enabling historians to read a world no living person remembered.

Unearthing the Past: The Case of Richard III

In late August 2012, an archaeological discovery beneath a council car park in Leicester provided another powerful example of historical reconstruction. Joe Applebee, an osteoarchaeologist, lifted bones from a trench that revealed the remains of Greyfriars church, demolished in 1538. The skeleton showed severe scoliosis, curving the spine into an 'S' shape. The individual was male, in his late 20s to late 30s, slender, and about 5'8 without the bend. Ten wounds, eight to the skull and one to the pelvis, indicated a violent death, and the absence of a coffin suggested a hurried burial. These clues pointed towards Richard III, who died on August 22, 1485, at the Battle of Bosworth, the last English king killed in battle.

However, a bent back alone does not prove identity. Historians and scientists meticulously cross-referenced evidence. They drilled a tooth for mitochondrial DNA, comparing it to Michael Ibsen, a descendant 19 generations removed from Richard's sister Anne of York, and to a second anonymous relative. The genomes matched, with only one base difference in the second line across centuries. Radiocarbon dating placed the bones between 1455 and 1540. Stratigraphy, trauma, the spinal curve, DNA, and the radiocarbon date provided five checks, all pointing to one man. This careful triangulation of diverse evidence, from archaeology to genetics, allowed for a conclusive identification.

Beyond Words: The Archive's Shape and Power

It is valid to be skeptical. If every source has a bias and every copy has an error, can we truly know anything for sure? Historians concede that most of the past left no paper. Plaster casts preserve bodies at Pompeii, but not their words. Hastings left an embroidery and three sentences in a chronicle, but no casualty list. For most villages, most years, and especially for most women, enslaved people, and poor people, we have almost nothing. The archive has a shape, and that shape is power, reflecting what power chose to store or what happened to survive.