The History of Eora, Volume V: The Great Orlan Empire is a book and quest item in The Forgotten Sanctum.
"...Engwith could not abide a competitor and certainly not a rival. They found both in the orlan empire of the northern valleys. More insulting than the empire's mere existence at the edge of Engwith's territory was the orlans' schema of social organization, which tended toward the communal, nonhierarchical, and animist. This was at odds with the Engwithans' veneration of the individual, the import they ascribed to social position, their unyielding devotion to codified religious dogma..."
Restricted Section: In the small alcove just north of the southern stairs to the Central Stacks.