TIL there was no single burning of the historic Great Library of Alexandria. The “single burning” story is just myth.

Instead, the Library of Alexandria was slowly defunded and its librarians, intellectuals purged from Alexandria. Over generations its prominence and scholarship slowly faded away, and the collection was likely slowly lost to corruption, war, plunder, dilapidation, or dispersed across other private and public collections.

https://en.wikipedia.org/wiki/Library_of_Alexandria