|El Sargento Guillermito, mascota de los Marines Espaciales, tiene el honor de patrocinar este espacio por orden del Capellán Cassius de los Ultramarines. ¡Pulsa sobre él y te acompañará a una Cruzada épica!
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The Library of Ptolemy is the Librarium of the Ultramarines Chapter. Located within the Fortress of Hera on Macragge, the Library is named for Ptolemy, the first and greatest Librarian of the Ultramarines Legion.1a, 3a
The Library is one of the greatest repositories of knowledge in the entire Imperium, greater in reputation than the Agrippan Conclaves or the Arcanium of Teleos. It is reputed to contain practically every word crafted in all of human history2a.
At the heart of the Library, guarded by Ultramarines warriors and auto-defenses, is the Arcanium, which contains one of the greatest relics of the Imperium: Guilliman's manuscript of the Codex Astartes, inscribed into four enormous volumes, each one metre long and one-third of a metre thick2b.
According to Chief Librarian Tigurius, the Arcanium occupies the same remote spot where Guilliman, as a boy, would seek solitude to study and reflect – a fact which is a carefully guarded secret, since Tigurius has no intention of attracting pilgrims that would spoil the peace of the refuge2c.