Why did the Library of Alexandria become famous in history?

The Library of Alexandria was associated with the Ptolemaic Kingdom in Egypt, probably founded in the 3rd century BCE. It was linked to the larger scholarly complex called the Mouseion, where scholars studied literature, mathematics, astronomy, and medicine. Its exact size is unknown, but ancient writers described it as an extraordinary repository of texts and learning. The library became legendary partly because of its intellectual importance and partly because its decline was gradual and historically debated. By late antiquity, changing political and cultural conditions had reduced its former prominence.