The Longbeard Dwarves of Khazad-dûm colonized the Iron Hills in the First Age. The Hills were their primary source of iron-ore. The Dwarf road through Greenwood ran north-east to the Hills for the dwarf-traders and merchants between Khazad-dûm. Also in the First Age, some Men who migrated out of the east—"laggard kindred" of the Edain—chose to settle in the lands between the Iron Hills and Mirkwood, becoming the Northmenof Rhovanion.
After Sauron destroyed Eregion in the Second Age, the Longbeards sealed Khazad-dûm and Orcs took control of the northern Misty Mountains. This ended communication between the Iron Hills and Khazad-dûm for some time.
In TA 1981 the last of the Dwarves living in Khazad-dûm fled from the Balrog which had slain kings Durin VI and Náin I. Some of those who escaped wandered as far as the Iron Hills and resettled there.
In TA 2570 Dragons began afflicting the Dwarves in the north and in TA 2589 King Dáin I was slain by a cold-drake outside his halls in the Grey Mountains. Due to these depredations, in TA 2590 Grór son of Dáin left the Grey Mountains and established a Lordship in the Iron Hills.
Over the next few centuries Grór and his people built a prosperous settlement in the Hills, especially after the destruction of Erebor in TA 2770 when the Dragon Smaug scattered the Longbeards who dwelt there. Most of the survivors subsequently went to their kinsmen in the Iron Hills, swelling its numbers.
With the death of Smaug in TA 2941 Lord Dáin Ironfoot led his warriors in the Battle of Five Armies near Erebor. The battle was won, but Thorin II Oakenshield was slain and Dáin became the new King under the Mountain and King of the Longbeards as Dáin II. He relocated to Erebor with many of his people, and re-established it as Durin's folk's greatest and strongest dwelling in the north. It is likely that the Iron Hills remained inhabited by Dwarves into the Fourth Age.
The Iron Hills were located in the northeastern parts of Middle-earth. The hills were situated on the boundary between Rhovanion and Rhûn. The hills were to the east of the Lonely Mountain.
The Iron Hills were rich in minerals, most notably iron – whence came the name of the Hills. The Hills were originally a part of the massive Iron Mountains where Morgoth dwelt; other remains of this vanished range were the Mountains of Angmar and Ered Mithrin. The Iron Hills were also the source of the River Redwater, the reddish colour of which came from iron particles in its water. The river joined with the River Running to flow into the Sea of Rhûn.
There was at least one settlement in the Iron Hills, the seat of Grór and his descendants, but there is no indication of its name or precise location.
Notable Dwarves of the Iron Hills
- As mentioned above, Grór was the son of Dáin I and was also the founder and first Lord of the Iron Hills.
- Náin was the son of Grór. He was killed during the Battle of Azanulbizar by the Orc lord Azog of Moria.
- Dáin II was son of Náin and became the lord of the Iron Hills after the death of his grandfather. He was considered a mighty Dwarf because he killed the Orc Azog when he was at an age which was considered young to the Dwarves. He became the King under the Mountain after the slaying of Smaug and loss of Thorin II Oakenshield in the Battle of the Five Armies, until his death during the War of the Ring.
- Thorin III was the son of Dáin II, and became king after his father's death in the Battle of Dale. He was praised for helping to reconstruct the Lonely Mountain and Dale. During his rule a new Dwarven settlement was founded in the Glittering Caves.
|Foreign Language||Translated name|
|Belarusian Cyrillic||Жалезныя Пагоркі|
|Bulgarian Cyrillic||Железните Хълмове|
|Catalan||Turons de ferro|
|Cebuano||Puthaw nga mga Bungtod|
|Chinese (Hong Kong)||鐵丘陵|
|Corsican||Culline di Ferro|
|Danish||Jernhøjene / Jernbjergene|
|Finnish||Rautamäkiä or Rautavuoret (depending on traslator)|
|French||Collines de Fer|
|Galician||Montes de Ferro|
|Igbo||Ígwè ugwu nta|
|Irish Gaelic||Cnoic Iarann|
|Italian||Colline del Ferro|
|Kazakh||Темір төбеден (Cyrillic) Temir töbeden (Latin)|
|Kurdish||Çiyan Hesin (Kurmanji)|
|Kyrgyz Cyrillic||темир адырлар|
|Macedonian Cyrillic||Ирон Хиллс|
|Mongolian Cyrillic||Төмөр толгод|
|Pashto||ناوتو كوي غونډيو|
|Portuguese||Colinas de Ferro (Brazil)
Montes de Ferro (Portugal)
|Punjabi||ਲੋਹੇ ਦੀਆਂ ਪਹਾੜੀਆਂ|
|Romanian||Dealurile de Fier|
|Scottish Gaelic||Iarann Cnuic|
|Serbian||Гвоздена брда (Cyrillic) Gvozdena brda (Latin)|
|Sesotho||Tšepe maralla a|
|Spanish (Spain and Latin America)||Colinas de Hierro|
|Tajik Cyrillic||теппаҳо дарзмол|
|Ukrainian Cyrillic||Ірон Гіллс|
|Uzbek||Темир Тепаликлар (Cyrillic) Temir Tepaliklar (Latin)|
|Yucatec Maya||Colinas Hierro|
|Zulu||Izintaba zensimbi ?|
|Mountain Ranges of Arda|
Ash Mountains | Echoriath | Ephel Dúath | Ered Gorgoroth | Blue Mountains | Ered Lómin | Grey Mountains | Ered Wethrin | Iron Hills | Iron Mountains | Misty Mountains | Mountains of Angmar | Mountains of Mirkwood | Mountains of Mithrim | Orocarni | Pelóri | Wall of the Sun | White Mountains | Yellow Mountains
|Dwarven Realms of Middle-earth throughout the Ages|
|Years of the Trees:||Amon Rûdh | Belegost | Khazad-dûm | Mount Gundabad | Nogrod | Nulukkizdîn | Blue Mountains|
|First Age:||Amon Rûdh | Belegost | Khazad-dûm | Mount Gundabad | Nogrod | Nulukkizdîn | Iron Hills | Blue Mountains|
|Second Age:||Khazad-dûm | Belegost | Nogrod | Mount Gundabad | Blue Mountains | Iron Hills|
|Third Age:||Grey Mountains | Iron Hills | Khazad-dûm | Lonely Mountain | Blue Mountains | Dunland|
|Fourth Age:||Glittering Caves | Khazad-dûm | Lonely Mountain | Blue Mountains | Grey Mountains | Iron Hills|