In "The Sandman", Lucien is the librarian of Dream's castle and the first among Dream's servants. He was not created by Dream, like many of the other denizens of his realm; rather, Lucien, like Dream's ravens, was once a mortal who accepted an offer to serve Dream immortally in his realm. Lucien is loyal to Dream without question or restraint, and never has been known to fail or abandon his assigned tasks.