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This article describes a concept which is mentioned in J.R.R. Tolkien's works, but was never given a definite name.
|Followed by||Lonely Mountain|
 Establishment and Thráin's reign
Several years after the Sack of Erebor by the dragon Smaug, the exiled King of Durin's folk Thrór was murdered by Orcs. Thráin II led a host of Dwarves from his and other house in a great war against the Orcs of the Misty Mountains. After that, Thráin's people moved to the hills of Dunland and stayed for some time before moving to the Blue Mountains and established their Halls in the year T.A. 2802.
For nearly forty years Thráin ruled his people in the Ered Luin, but was driven to obsession by his ring of power. In 2841 he left with a small group of followers to return to the Erebor determined to kill Smaug and take his father's realm back. But in 2845 while encamped on the eves of Mirkwood Thráin was captured by the servants of the Necromancer and taken to Dol Guldur; where he was tortured till his death many years later. His followers including Balin and Dwalin did not know his fate, and after searching for days they returned to the Ered Luin.
 Thorin's rule
Thorin was made ruler of Durin's folk, and under his leadership his people prospered, their trade increased as well as their numbers, not only from birth, but wandering Longbeards heard of Thorin's realm and came to him.
Thorin ruled in the Ered Luin for nearly one hundred years, until he met Gandalf the Wizard who helped him concoct a plan to take back Erebor from Smaug; he left his halls for the last time on a quest to take back his former home. After many months Thorin and Company took the mountain as theirs and Thorin declared himself King under the Mountain after Smaug was killed; but after a great battle with Orcs and Wargs Thorin was mortally wounded and died, never being able to enjoy the realm he gained.
 Dissolvement as the Capital
After Thorin's death, his cousin Dáin II Ironfoot of the Iron Hills became king of Durin's folk; and when news reached Durin's folk in the Ered Luin that Erebor was retaken, it is believed that most of them moved to the Lonely Mountain. therefore, Thorin's Halls became a sub-realm of Durin's folk.
 Portrayal in Adaptations
2007: The Lord of the Rings Online:
- Thorin's Halls is one of the major cities in the game, referred to as "Thorin's Hall". Following the death of Thorin, many Longbeards move away and the rule of Thorin's Hall falls to the Dourhands - the clan of Dwarves who are slowly corrupted by the Dark Lord. In T.A. 3016 King Dain sends a company of Longbeards to reclaim Thorin's Hall and Dourhands are thrown out, Dwalin becomes the ruler and maintains his position until T.A. 3019. Thorin's Hall is where the Dwarven characters begin their journey in Middle-Earth: the city itself is safe from dangers, but outlying outposts face the threats of wild beasts, remaining Dourhands and occasional Goblins.