Imperial Library of Constantinople

The Imperial Library of Constantinople (c. 361-1453 CE) was the last Great Library of the Classical Antiquity. Very little is known about it except that it seems to have contained Works from both Ancient Greece and Ancient Rome.
It may have contained many of the Books or copies of the Books from the Great Library of Alexandria.

Constantius II (337-61 CE) began the Imperial Library of Constantinople, according to Themestios writing in 367 CE.
The Ancient Scrolls and Works were copied by scribes into Codices made of Parchment or Vellum.
Julian (361-63 CE) enlarged it by adding his own Library to the Imperial Library.
In 372 CE Valens employed 7 copyists and their assistants, 4 to copy Greek texts and 3 to copy Latin texts.
In 475 CE we are told by Johannes Zonaras that the Imperial Library was damaged by fire and that it already contained 120,000 Books.
In 1204 CE, the Imperial Library was seriously damaged during the sack of Constantinople by the Fourth Crusade.
1261 CE, however, it was reconstructed in 1261 CE after Constantinople was recaptured.
In 1453 CE, the Library came to an end after the Ottoman Turks conquered Constantinople.

Part of the Library of Constantinople may have been incorporated into the Lost Library of Ivan the Terrible.