In 391 AD, Roman Emperor Theodosius outlawed Paganism and destroyed the Library of Alexandria

- The Royal Library of Alexandria or Ancient Library of Alexandria in Alexandria, Egypt, was one of the largest and most significant libraries of the ancient world. It was dedicated to the Muses, the nine goddesses of the arts. It flourished under the patronage of the Ptolemaic dynasty and functioned as a major center of scholarship from its construction in the 3rd century BC until the Roman conquest of Egypt in 30 BC, with collections of works, lecture halls, meeting rooms, and gardens. The library was part of a larger research institution called the Musaeum of Alexandria, where many of the most famous thinkers of the ancient world studied.

The library was created by Ptolemy I Soter, who was a Macedonian general and the successor of Alexander the Great. Most of the books were kept as papyrus scrolls. It is unknown precisely how many such scrolls were housed at any given time, but estimates range from 40,000 to 400,000 at its height.

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