A massive modern building of concrete, glass, and granite now sits along the waterfront of Alexandria, occupying the very spot where the ancient world’s greatest center of learning once stood.
This was the legendary Library of Alexandria, an institution that, according to the highest estimates, held more than 700,000 papyrus scrolls at its height.
Its destruction has inspired centuries of debate, myth, and speculation.
But what really happened?
What led to its downfall?
And how much knowledge was lost in the flames?
A Center of Knowledge That Amazed the World
Founded by Alexander the Great in 331 BCE, the city of Alexandria quickly became one of the most important ports of the ancient Mediterranean.
After defeating the Persians and proclaiming himself Pharaoh, Alexander made Alexandria the capital of Egypt—a role it held until Cairo eventually became the capital.
But his most lasting legacy was cultural: he laid the foundations for what would become the greatest library the world had ever seen.
The Library of Alexandria was established under the Ptolemaic dynasty, which ruled ancient Egypt from 323 BCE to 30 BCE.
It was Ptolemy II who also commissioned the famous Lighthouse of Alexandria, one of the Seven Wonders of the Ancient World, which served as a beacon for ships approaching the harbor.
Though often referred to in the singular, the Library actually consisted of two main buildings: the Museion and the Serapeum.
Within these walls, scholars from across the ancient world gathered: astronomers, mathematicians, poets, philosophers. Figures such as Euclid, Archimedes, Callimachus, and many more were part of the vibrant intellectual community that thrived within the Library’s walls.
Its shelves held papyrus scrolls containing pioneering works in science, geography, mathematics, astronomy, literature, and poetry.
The exact number of scrolls remains unknown. Historian Aulus Gellius estimated 700,000. John Tzetzes cited 490,000 in the Museion and 42,800 in the Serapeum.
Regardless of the count, the Library of Alexandria was colossal—far larger than anything else of its kind in the ancient world.
How Did the Library of Alexandria Disappear?
This remains one of history’s most debated questions.
There was no single catastrophic event—but rather a long chain of neglect, conflict, and political and religious decisions that gradually led to the Library’s disappearance.
According to Plutarch, the first significant damage came in 48 BCE, during Egypt’s civil war between Cleopatra and her brother Ptolemy XIII.
Julius Caesar, siding with Cleopatra, ordered that Ptolemy’s fleet, anchored in the harbor, be set ablaze. The fire reportedly spread to the Library, destroying a large part of it.
Later, in 391 CE, Emperor Theodosius I, having declared Christianity the official religion of the Roman Empire, ordered that all pagan temples be destroyed — including the Serapeum, which held part of the Library’s collection.
Any remaining scrolls were likely destroyed in 641 CE, when Amr ibn al-As conquered Egypt and allegedly burned the rest of the Library under orders from Caliph Omar.
The phrase attributed to him:
“If those books agree with the Qur’an, we have no need of them; and if they oppose the Qur’an, they must be destroyed.”
Centuries of knowledge vanished, though much of it may have been lost even without the flames.
The scrolls were made of papyrus, a plant that grew along the banks of the Nile. In the medieval era, parchment (made from animal skins) and paper from Asia gradually replaced it.
Papyrus was fragile—easily damaged by fire, moisture, insects, or mold. For texts to survive, they had to be copied regularly, which depended on sustained funding and political will.
As historian Richard Ovenden argued in Burning the Books,
The Library’s ultimate downfall was centuries of neglect, weak leadership, and insufficient resources.
What Knowledge Was Lost After the Destruction of the Library?
We will never know for sure.
It’s believed that the Library held original works or copies of works by authors such as Plato, Aristotle, Herodotus, Hippocrates, Pythagoras, Sophocles, Euripides, and others—along with scientific manuscripts, star maps, medical treatises, mathematical theories, and records of long-vanished civilizations.
Still, historian Garrett Ryan reminds us that other libraries held copies of many major texts, dispelling the myth that all ancient knowledge perished with the Library.
A great deal was lost, but not all of it.
The burning of the Library of Alexandria didn’t erase humanity’s past—but it severed a vital thread of intellectual continuity. It would be over a thousand years before the world saw an institution of this scale again.
And its symbolic destruction still resonates today.
Because what was lost wasn’t just books.
It was a whole way of seeking and safeguarding knowledge.
