|Location||East of Erebor, northwest of Rhûn|
|Description||Hill-remnants of the Ered Engrin and a realm of many of Durin's folk|
|Regions||The Kingdom of Durin's folk|
The Hills were mined for thousands of years by the Dwarves, being their main supply of iron. The Dwarf-road of Mirkwood ran northeast to the Hills for the Dwarf-traders that went to and from Khazad-dûm and the Hills.
In T.A. 2570 Dragons began afflicting the dwarves in the north and in T.A. 2589 Dáin I was slain by a dragon in the Grey Mountains. Due to these deprivations, in T.A. 2590 Grór left the Grey Mountains and established a realm in the Iron Hills. Over hundreds of years it became a great realm, especially after the destruction of Erebor in T.A. 2770.
During the Battle of Azanulbizar (T.A. 2799) the dwarves of the Iron Hills, led by Náin (son of Grór) and coming late and fresh to the fray, turned the day. Náin was slain by Azog in one-on-one combat. Náin's son, Dáin Ironfoot, then avenged his father by slaying Azog. After this battle Dáin Ironfoot led the Iron Hills dwarves home where he became their leader.
Before the death of Smaug in T.A. 2941, the dwarves' realm in the Iron Hills was the main dwelling of Durin's folk in the East, and also the strongest realm militarily in Wilderland. After Smaug's death Dáin Ironfoot became King under the Mountain and King of Durin’s Folk as Dáin II; how many dwarves may have returned to or stayed in the Iron Hills after the Battle of Five Armies is unknown.
- ↑ 1.0 1.1 J.R.R. Tolkien, Christopher Tolkien (ed.), The Peoples of Middle-earth, "The Tale of Years of the Third Age"
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Peoples of Middle-earth, "Of Dwarves and Men"
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 J.R.R. Tolkien, The Lord of the Rings, Appendix B, "The Third Age"
- ↑ 4.0 4.1 J.R.R. Tolkien, The Lord of the Rings, Appendix A, "Durin's Folk"