The Library of Alexandria was not destroyed in a single catastrophic fire, but declined over centuries due to multiple events, including budget cuts.
Why it is true
Contrary to popular myth, there was no single event that destroyed the library. Its decline was gradual, resulting from funding cuts, political purges, and damage in conflicts over several centuries, from the Roman period to the Islamic conquest.
Source: British Museum
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.