The Library of Alexandria was one of the largest and most significant libraries in the ancient world. The Order of Hermes and the Ahl-i-Batin made extensive use of the library and its associated node. The Hermetics and saved and relocated many of its important texts as the mundane part of the institution fell into decline. They dedicated the node associated with the library to the construction of Horizon in 1452, although not without considerable debate.
For information on the real-world location, see: Library of Alexandria.