The Mareilon Historical Society, established sometime before the end of the fourth century, was headed by the Chief Historian. The annex of this organization was located within the Citadel of Mareilon. It was an impressive structure, two stories in height, built of proud brick, with many sculpted balconies gracing the shaded windows. This building, along with the rest of Mareilon was destroyed in 773 GUE by the Endless Fire.