The Library of Alexandria wasn't destroyed in one fire

The Library of Alexandria was not destroyed in a single fire. It declined over several centuries, after royal patronage dried up from the 140s BC, when Ptolemy VIII expelled foreign scholars, and Roman support proved patchy. The historian Roger Bagnall argues that slow neglect and decay were as damaging as any one disaster. Each famous “destruction” story was written down long after the event it describes:

• 48 BC: Fighting in Alexandria, Julius Caesar fired the enemy’s ships. Plutarch, writing more than a century later, says the blaze “spread from the dockyards and destroyed the great library”. The library is still referred to after Caesar’s time, so the loss was not total. Four years later Caesar himself was assassinated in Rome.
• AD 272: Emperor Aurelian retook the city from Queen Zenobia’s Palmyrene Empire and destroyed the district where the library stood. Diocletian levelled the district again in 297. Many historians see these as the likeliest ends of what was left, though no contemporary mentions books.
• AD 391: Christians destroyed the Serapeum, a temple that had held a “daughter library”. There is no evidence that the library was destroyed with it.
• AD 641: The Arab conquest. The story that Caliph Umar ordered the whole collection burned first appears about 600 years later in 13th-century writers such as Ibn al-Qifti. Scholars have treated it as fiction since the 18th century.

The numbers grew as the stories were retold. Writing four centuries after Caesar, Ammianus Marcellinus claimed that 700,000 books burned in his war, and he placed those libraries in the Serapeum, which Caesar’s fire probably never reached. Modern scholars think the collection was smaller and less all-embracing than such figures suggest. As with the legend that Nero fiddled while Rome burned, the vivid version is the one that survived.