However, this version of events is not confirmed in contemporary accounts of Caesar's visit. In fact, it has been reasonably established that segments of its collection were partially destroyed on several occasions before and after the
first century BC. A modern myth (no older than the late eighteenth century) attributes the destruction to Coptic Christian Archbishop
Theophilus of Alexandria in 391, who called for the destruction of the
Serapeum; but in fact there was no connection between the library and the Serapeum, and no good historian of late antiquity takes the claim seriously. A more credible version of the story, not recorded till the thirteenth century, blames the Muslim sacking of Alexandria in 642.
[1]