The Old Lingolf House near Largoneth is a monument that is joined to the Lonely Mountain by the Shady Brook Trail. Once the home of the renowned miser Walter Lingolf, has never been in anything other than a state of disrepair. With his iron-clad wallet protected by hellhounds, Lingolf designed the home to already have boarded up windows and only half a roof to save on glass and labor costs. Since his passing the condition of the house slightly improved, with newly built birds' nests providing some cover and insulation. It was said that sometimes, in the dead of night, Lingolf's ghost would appear and loudly complain about how much his descendants were wasting on food, water, and shelter. A fortress was later constructed at this sight for use by the Lingolf Garrison.

Heffilmurm was captain of the Lingolf Garrison in 398 GUE, which was a military unit barely over 200 strong. These gathered men were responsible for Quendor's defeat of the fallen Implementor Belegur in the same year.

In 659, the night of the New Year's Revolt, troops from Lingolf rioted against Largoneth. Some historians believe that Duncanthrax was not the commanding general of the Royal Militia, but rather an extremely high-ranking officer, perhaps a second in command in charge exclusively of these nearby Lingolf forces. According to a Royal Diaries (a document of which authenticity is still debated), Zilbo III knew that the threat to the royal authority stemmed from a military power outside the castle itself, specifically from the nearby Lingolf Garrison, a fortress that might conceivably have been under Duncanthrax's command. Zilbo ordered the Captain of the Guard to forsake the coastal approach in favor of protection of the land routes, as he knew if the mountain pass fell to Lingolf, all was lost. Disjointed records report that this Garrison successfully raided the castle.

After the fall of the Great Underground Empire in 883, the governor of Galepath secured the allegiance of the Lingolf Garrison and gained control over the Lonely Mountain and its nearby villages, coastal routes and highway approaches, thus bringing his territory almost to the border of the old Mareilon Province.

As of a date prior to 956 GUE, all but a ruined stone foundation has marked the site of this estate.