|Location||Northwest of Erebor, north of Mirkwood|
|Realms||Capital of Durin's Folk for a time, Orc tribes, Dragon hoards.|
|Inhabitants||Durin's Folk, Dragons, and Orcs|
|Description||A rich mountain range of many ores, it has since ancient times been considered by Durin's folk as part of their territory|
|Other names||S. Ered Mithrin|
|Events||War of the Dwarves and Dragons, slaying of Scatha the Worm|
|References||Appendix A, The Hobbit, The Peoples of Middle-earth|
North of the Grey Mountains lay the Northern Waste. In the west, where the Grey Mountains met with the Misty Mountains rose Mount Gundabad, an ancient Dwarven holy site and later the capital for the Orcs of the north. The eastern end of the Grey Mountains was split into two chains, and in between lay the Withered Heath, where Dragons bred. After that was a wide hilly plain, beyond which lay the Iron Hills. Erebor, the Lonely Mountain, lay south of the Grey Mountains.
 Early history
In the First Age, the Longbeards established mansions in Moria and the Iron Hills, and they considered the Grey Mountains, which lay between these mansions, to be within their territory. Also during the First Age, some men—mostly associated with the House of Hador—settled between the Grey Mountains and Mirkwood, and they allied with the Longbeards against Morgoth's Orcs. This alliance ended in the Second Age after Sauron destroyed Eregion, which prompted the Longbeards to seal Moria. During this time, Orcs took control of the Grey Mountains.
 Third Age
In T.A. 1980 a Balrog appeared in Moria and by the next year the Dwarves fled. Durin's folk were scattered. Thráin I reestablished the Kingdom under the Mountain but Thorin I went to the Grey Mountains where most of the Dwarves gathered. Nearly six hundred years later, Dragons began afflicting the Dwarves. In 2589 Dáin I was slain by a Dragon and the Grey Mountain strongholds were abandoned after the Wars of the Dwarves and Dragons. About 2480 Orcs had begun to infest the Misty Mountains and spread to the Grey Mountains, such that by 2941 Gandalf the Wizard could say that the range was "simply stiff with goblins, hobgoblins, and orcs of the worst description". However, after the Battle of Five Armies the number of Goblins in the Grey Mountains were greatly reduced (some three parts of them had perished).
It seems that some Dwarves still dwelt in the Ered Mithrin during the late Third Age, so it is likely after the War of the Ring, the Dwarves drove whatever Drakes and Orcs were left totally from the mountains, and reclaimed the rest of their halls and mines in the Grey Mountains.
 Other versions of the legendarium
- ↑ 1.0 1.1 1.2 J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "The West of Middle-earth at the End of the Third Age" [map]
- ↑ 2.0 2.1 J.R.R. Tolkien, Christopher Tolkien (ed.), The Peoples of Middle-earth, "Of Dwarves and Men", "Relations of the Longbeard Dwarves and Men", pp. 302-303
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Peoples of Middle-earth, "Of Dwarves and Men", "Relations of the Longbeard Dwarves and Men", p. 305
- ↑ 4.0 4.1 J.R.R. Tolkien, The Lord of the Rings, Appendix B, "The Third Age"
- ↑ J.R.R. Tolkien, The Lord of the Rings, Appendix A, "Durin's Folk"
- ↑ J.R.R. Tolkien, The Hobbit, "Queer Lodgings"
- ↑ J.R.R. Tolkien, The Hobbit, "The Return Journey"
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Shaping of Middle-earth, "V. The Ambarkanta"