The Library of Alexandria

The Library of Alexandria was founded in the early 3rd century BCE by Ptolemy I Soter — the Macedonian general who took control of Egypt after the death of Alexander the Great — and developed under his son Ptolemy II Philadelphus. It was part of the Mouseion (Museum) — a great research institution dedicated to the Muses, housing scholars in residence who were provided with food, lodging and salaries by the Ptolemaic state. The Library was its central resource.

The Ptolemaic project was explicitly imperial and comprehensive: to gather all the books in the world. Ships arriving in Alexandria's harbour had their books confiscated and copied — the originals kept, copies returned to their owners. Ambassadors were sent across the Mediterranean world to purchase texts. The library allegedly borrowed the official Athenian state copies of the plays of Aeschylus, Sophocles and Euripides, paying a large deposit — and then kept the originals and returned copies, forfeiting the deposit. This aggressive acquisitiveness produced the largest collection of written knowledge in the ancient world.

Estimates of the Library's holdings range from 400,000 to 700,000 scrolls — but these numbers require care. Ancient "books" were typically much shorter than modern ones; a single Homeric epic might occupy one scroll, or might be divided across several. The number of distinct works was probably smaller than the scroll count suggests, and many works existed in multiple copies and variant editions. Still, by any measure the collection was extraordinary — the accumulated written knowledge of Greek, Egyptian, Persian, Jewish, Indian and other traditions, gathered in a single place.

The Library was served by a series of distinguished librarians — scholars of the first rank, appointed by the Ptolemaic rulers. Among them: Callimachus of Cyrene, who created the Pinakes — the first systematic catalogue of Greek literature, organized by genre and author, running to 120 volumes — a foundational act in the history of bibliography. Eratosthenes of Cyrene, who calculated the circumference of the earth to within a few percent of the correct value using only a stick, the shadow it cast and a measurement between two Egyptian cities. Apollonius of Rhodes, who wrote the Argonautica. These were not librarians in the modern sense of custodians of existing knowledge — they were the greatest scholars of their age, and the Library was their laboratory.

The question of what was lost when the Alexandrian tradition ended is both easier and harder to answer than the burning myth suggests. Easier — because we actually know quite specifically what ancient works are missing. Harder — because the losses were not all caused by the Library's decline, and some of what was "lost" has since been recovered.

Of the 123 plays of Sophocles, only 7 survive. Of Aeschylus's 90 plays, only 7. Of Euripides's 92, only 18 — plus fragments. Of the comedies of Menander, almost nothing survived until papyrus fragments were discovered in Egypt in the 20th century. Of Aristotle's published dialogues (which ancient readers considered his best work), nothing survives — only his lecture notes, which we call his works. Of Aristarchus's heliocentric model, only a single reference in Archimedes tells us it existed. The mathematical work of Hipparchus — the greatest ancient astronomer — is mostly lost, known only through Ptolemy's later synthesis.

What survives from antiquity is a small, unrepresentative sample — biased toward texts that were useful to the Christian church, that were copied in Byzantine monasteries, that happened to be found in Egyptian rubbish heaps preserved by the desert climate, or that were translated into Arabic and thus preserved in the Islamic scholarly tradition when Greek originals were lost. The loss of the ancient world's knowledge was not a single catastrophe but a long, uneven, partially recoverable attrition. And it continues: papyrus fragments still emerge from the sands of Egypt; multispectral imaging reveals texts in carbonised scrolls from Herculaneum; the Archimedes Palimpsest recovered mathematical texts scraped off and overwritten by medieval monks.

The myth of the Library of Alexandria — the single catastrophic burning, the irreplaceable loss, the dark ages that followed — is as significant as the historical institution itself. It is one of humanity's most persistent and most powerful stories about knowledge, and it has been deployed repeatedly by different groups for different purposes: by Enlightenment writers blaming Christianity for the fall of Rome, by 19th-century secularists attacking religion, by popular scientists like Carl Sagan making the case for rational inquiry. In the 1980 television series Cosmos, Sagan's moving depiction of the Library's burning remains one of the most effective pieces of science communication ever made — and is historically inaccurate in important details.

What the myth encodes — whatever its historical inaccuracies — is something real: the recognition that knowledge is fragile, that civilisations can forget what they once knew, that the thread connecting us to the past can be broken. The ancient world knew things we have had to rediscover — Aristarchus's heliocentrism, Hero of Alexandria's steam engine (which he treated as a toy), Roman concrete whose formula was lost for a millennium. The myth of the Library makes this fragility vivid and emotionally immediate in a way that accurate historical description cannot.

The Bibliotheca Alexandrina — the new Library of Alexandria opened in 2002 near the site of the ancient one — is itself an act of engagement with the myth: a modern institution self-consciously placing itself in the tradition of the ancient library, attempting to be a centre of culture and knowledge for the Arab world and the Mediterranean. Whether it succeeds in this ambition, the gesture itself demonstrates the power of the Alexandria myth to inspire concrete action two thousand years later.