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The Lonely Mountain, known in Sindarin as Erebor, referred to both a mountain in northern Rhovanion and the subterranean Dwarven city contained within it. In the latter half of the Third Age, it became the greatest Dwarvern city in Middle-earth.

It was located northeast of Mirkwood, near the Grey Mountains, and was the source of the River Running.


Third Age[]

Durin's Folk discovered the mineral wealth of the Lonely Mountain during the Second Age, but the colony only came into its own after the fall of Khazad-dûm. In TA 1999 King Thráin I led his people there and became King under the Mountain. In time, they became very rich and amassed a large amount of gold and treasure which included the jewel known as the Arkenstone. Thráin I used the Arkenstone as a symbol of his rule, and his sons and grandsons under him who were to follow.

For two-hundred and eleven years the kingdom advanced, expanded and prospered until Thorin I abandoned it to join his kin in the Grey Mountains in TA 2210. The Lonely Mountain was abandoned for three-hundred and eighty years. However, the Dwarves of the Grey Mountains began to be attacked by the dragons that still lived in those mountains, and became embroiled in a costly war against them, which forced the Dwarves to abandon the Grey Mountains in TA 2590. They went their separate ways: Grór and his followers settled in the Iron Hills, and Thrór with his followers went to the Lonely Mountain.[2]

Under Siege[]

While Thorin II was out hunting one day in TA 2770, Smaug flew in from the northern mountains and attacked the Lonely Mountain. After laying waste to both Erebor and the neighbouring town of Dale, Smaug made the mountain his domain and hoarded the kingdom's wealth for himself. Thrór, his son Thráin and several companions escaped through a Side-door. For many years thereafter the Dwarves lived in exile, first in Dunland and then the Blue Mountains. After a time, Thráin II grew restless and set out with a band of companions in TA 2841 to return to the mountain, but was harassed by Orcs and Wargs the whole way. Thráin vanished one morning four years later, and the attempt was abandoned.

Then seemingly by chance, Gandalf met Thorin in Bree, where together they planned to reclaim the mountain.[3]

Lonely Mountain, Soni A-Hender

The Lonely Mountain, by Soni Alcorn-Hender

Quest for Erebor[]

In TA 2941, Bilbo Baggins and Thorin's company traveled to the Lonely Mountain to regain the treasure Smaug had stolen. Set into the side of the mountain was a secret door, five feet high and wide enough for three to walk through abreast. Gandalf had managed to obtain the door's key and a map to its location from Thráin II, which could be found only when the setting sun and the last moon of autumn (also known as Durin's Day) would shine their light upon the keyhole. It took many days to find the door, and luckily for Thorin and Company, they did arrive on Durin's Day and were able to enter the mountain.

Smaug was eventually slain, shot out of the sky by a well-aimed black arrow at his only weak spot by Bard the Bowman, a man of Lake-town and a descendant of Girion, the last Lord of Dale. He was later declared king of the restored Kingdom of Dale. Thorin thus reclaimed the mountain, but the Elves of Mirkwood and Men of Lake-town sought a part of the treasure, which Thorin refused to share. Dáin II came to Thorin's aid, and the three races almost broke into war, until a host of Orcs and wolves attacked, eager to break the strength of all three peoples. Dwarves, Elves, and Men, together with the Eagles, battled the Orcs in what became known as the Battle of Five Armies. During the battle, Thorin was mortally injured, and the titles of King under the Mountain and King of Durin's Folk passed to Dáin.

War of the Ring[]

Battle of Dale[]

The demise of Smaug was not to be the last of the Lonely Mountain's many troubles. In TA 3019 on the 17th of March, a horde of Easterling soldiers from Rhûn swarmed over the Redwater river, opening up a new front in the northern theater of the War of the Ring. The Men of Dale fell back to the protection of the Lonely Mountain.


Kings Brand and Dáin ready to defend their kingdoms

Dwarves and Men fought a pitched battle against the invaders, in which Dáin and Brand, the King of Dale, were killed. The impenetrable gates and walls of the Lonely Mountain, buttressed and secured with advanced, complex, and resilient Dwarven stonecraft and smithwork, easily withstood the siege equipment of the Easterlings. The many years spent improving the Lonely

Last resistance

The last resistance against the forces of Sauron

Mountain's defenses had paid off, and the Easterlings were unable to gain entry. Following the news of the destruction of the One Ring and the fall of Sauron, the Dwarves and Men of Dale sortied and routed the besieging army.

Fourth Age[]

As Dáin was killed during the War of the Ring, lordship of Erebor passed to his son Thorin III, who ruled well into the Fourth Age. During this time, Dwarves from the Lonely Mountain helped rebuild cities in Gondor and the fortress of the Hornburg, and some went to the newly established Dwarven colony in the Glittering Caves where Gimli was lord. Eventually, an expedition was led from the mountain to reclaim the Longbeards' ancestral home of Khazad-dûm.

In adaptations[]

The Hobbit film trilogy[]

Peter Jackson's The Hobbit trilogy (2012-2014) featured computer-generated shots of the Lonely Mountain, Dale, and other Dwarven cities.

Erebor is seen in flashbacks as the elderly Bilbo Baggins recounts the beginnings of his adventure, along with Dale.

Erebor is described as the stronghold and subterranean realm of Thrór, King under the Mountain, most powerful among the Dwarf lords and the strongest Dwarf kingdom in Middle-earth beneath the Lonely Mountain, and it's ruler being considered the lord of all Dwarf mansions. Alongside it's neighbor, Dale, a great prosperous city of Men and Esgaroth, prosperity became commonplace in the Dwarven realm. Eventually, the Dwarves of Erebor uncover riches beneath the earth, making their realm into a great kingdom, and benefiting Dale. While the Dwarves are mining, the Arkenstone is discovered, which Thrór proclaims the King's Jewel, while forging a golden statue in his likeness.

Succumbing to greed, Thrór denies his potential ally, Thranduil, the Elven King of the Woodland Realm, ownership of the White Gems, which creates a rift between their peoples, with Thranduil warning the Dwarf lord of his vast horde of gold luring evil in the future. With Thrór losing himself in his greed, he spends longer time periods in his lower halls with his gold, must to his grandson's fear. The Elven king's prediction came to be true as the vast wealth attracts the dragon, Smaug, noticed by Thorin, who lays waste to the city of Dale, unhindered by Girion, despite the use of Black Arrows. Thorin rescues Balin from incineration and rallies troops for a confrontation with Smaug, who bests the marshaled army. Thorin survives and rescues his grandfather, who in avarice, fled to his treasure hoard, losing the Arkenstone.

Thorin leads an exodus of Dwarves from their stolen homeland, Thorin sees Thranduil and his soldiers approaching, pleading for help. Thranduil, bitter over his rift with Thrór, withdraws alongside his forces, making Thorin hateful of Elves for a long period. Thorin leads his people across Rhovanion and into Dunland, where he works as a blacksmith to provide for his people and leads them into the Blue Mountains. But he never got over the loss of his home, not forgiving or forgetting.

After losing Erebor, the Dwarves became a nomadic people, residing in human settlements. After their losses in the Battle of Moria, with both the king and the prince gone, Thorin led his people into the Blue Mountains, where they ultimately established a new colony. Many accepted the Blue Mountains as their new home, with Thorin's nephews, Fíli and Kíli born in there, but several viewed Erebor as their true home.

The Quest of Erebor[]

In TA 2941, Bilbo Baggins and Thorin's company traveled to the Lonely Mountain to regain the treasure Smaug had stolen. Set into the side of the mountain was a secret door, five feet high and wide enough for three to walk through abreast. Gandalf had managed to obtain the door's key, which fit a key hole which could be found only when the setting sun and the last moon of autumn (also known as Durin's Day) were in the sky would the light shine upon the keyhole. Bilbo entered the mountain himself, stumbling upon the dragon Smaug, who he met for the first time. The company tried to eliminate Smaug themselves by burying him under molten gold made in the forges; however, the trap failed.

Smaug was enraged by the actions of Thorin and Company and, to punish them, set his eyes on destroying Lake-town and its citizens. When Smaug came to the city, the Master packed up his treasure and left by boat. He was however crushed under Smaug's carcass when Bard slew him, but not before the dragon burned the whole of the town and many of its people.

Battle of Five Armies[]

The survivors fled by boat to the shore, where they lived in tents before Bard came and ordered them to leave for the ruins of Dale. Thranduil came to his aid, but only with the intention of recruiting the people of Lake-town to his cause of forcing Thorin to surrender some of the riches of the mountain to him. Bard convinced Thranduil he could reason with Thorin without the need to go to war. However, Thorin, overcome by the gold sickness, refused, sending Bard away. Without any other option, Bard and Thranduil joined forces, leading to a small siege around Erebor. During the night, they were visited by Bilbo, who Bard recognized from Lake-town, who gave them the Arkenstone, believing that they could use it to their own advantage. Meeting at the front gate, Thranduil and Bard ransomed the Arkenstone; however, Thorin did not believe it was the stone he was searching for until Bilbo revealed it was the true Arkenstone. Enraged, Thorin nearly killed the hobbit, believing it was betrayal, until Gandalf intervened, demanding Thorin release Bilbo and remarking that set an ill example as King under the Mountain. The dwarf king released Bilbo but banished him from Erebor, refusing to ever accept help from Wizards or Hobbits again.

Dáin Ironfoot arrived at that moment, and a small skirmish ensued among the Dwarves, Men and Elves. Gandalf attempted to reason with Dáin, telling them they were all fighting the wrong enemy and the true one was heading its way, led by Azog, who was sent to take Erebor for his master, Sauron because of its' strategic position. However, the Elves and Men began to fight the Dwarves, who appeared to have the upper hand until three Were-worms dug through the ground, as the Forces of Dol Guldur emerged. To Dáin, Thranduil, and Bard's horror, Gandalf had spoken the truth upon watching Azog's armies emerge.

The three Free Peoples almost did battle with one another, but then Orcs attacked and the Dwarves, Elves, and Men joined ranks together with the Great Eagles against the Orcs, in what became known as the Battle of Five Armies. The battle extended to the city of Dale, meant to serve as a distraction. As Dáin and his people fought, they were lost without Thorin's absence.

After Thorin overcame his gold sickness, the Dwarves emerged from the mountain, the company joined in the Battle of the Five Armies. Thorin decided to lead an assault towards Azog's command tower in Ravenhill. Dwalin, Balin, Fíli and Kíli commandeered a Dwarven war chariot, following Thorin through the frozen channel of the River Running. Azog, intending the entire battle as a trap for Thorin, tried to stop his friends from reaching him, sending ogres, a Troll and Wargs after them. Bofur, astride a Troll, managed to help them against the Troll, but the Wargs forced Dwalin, Fíli and Kíli to take the mounts and leave Balin behind to fend off his foes while they went to Ravenhill.

During the showdown between Azog and Thorin, the Eagles, Radagast and Beorn arrived, quickly dispatching the Gundabad army. During the battle, both Thorin and Azog mortally wounded each other, resulting in their deaths.


In the wake of the battle, a funeral was held for Thorin Oakenshield, Fíli and Kíli, with members of Thorin and Company, Beorn and Radagast in attendance while those in the city of Dale honored those who had fallen in battle. The mountain was garrisoned by the Dwarves of the Iron Hills and portions of its wealth were distributed to various parties like the Lake-men, who set up permanent residence in Dale and elected Bard as the new King of Dale.

The Elves of Mirkwood stayed just a short time to receive their share of the treasure before returning to their forest homeland. With Thorin and his immediate family members dead, Dáin succeeded him as King under the Mountain. His job done, Bilbo Baggins parted ways with the Company and returned home to the Shire with Gandalf with his secret magic Ring always close at hand.

Video games[]

The Lord of the Rings Online - Lonely Mountain

Erebor in The Lord of the Rings Online

In The Lord of the Rings Online, after a minor appearance depicting the Siege of Erebor, Erebor proper was added in 2018 as part of Eryn Lasgalen and the Dale-lands. After the breaking of the siege, it is now ruled by King Thorin III who must deal with some of the enemy's army still remaining near his lands. Other than the main hall of Erebor, players can also visit the living quarters, the burial tombs as well as several hidden chambers within the Mountain. Dookie



Foreign Language Translated name
Afrikaans Eensame Berg
Albanian Mal i Vetmuar
Arabic الجبل الوحيد
Armenian Միայնակ լեռ
Assamese অকলশৰীয়া পৰ্বত
Azerbaijani Tənha Dağ
Belarusian Cyrillic Адзінокая Гара (Lonely Mountain) Эрэбар (Erebor)
Bengali লোনলি মাউন্টেন
Bosnian Usamljena planina
Bulgarian Cyrillic Самотна планина (Lonely Mountain) Еребор (Erebor)
Burmese အထီးကျန်တောင်ကြီးတောင်ငယ်
Cambodian ភ្នំឯកោ
Cebuano Mingaw nga bukid
Chinese (Continental) 孤山
Chinese (Hong Kong) 孤山
Catalan Muntanya Solitària
Croatian Usamljena planina
Czech Osamělá hora
Danish Det Ensomme Bjerg
Dutch (Netherlands And Belgian) Eenzame Berg
Esperanto Soleca Monto
Estonian Üksildane Mägi
Basque Mendi Bakartia
Filipino Nag-iisang Bundok
Finnish Yksinäinen vuori
French Mont Solitaire
Frisian Iensume Berch (Western)
Galician Montaña Solitaria
Georgian ეული მთა (Lonely Mountain) ერებორი (Erebor)
German Einsamer Berg
Greek Μοναχικό Βουνό
Gujarati લોન્લી માઉન્ટેન
Hawaiian Mehameha Mauna
Hebrew (Erebor) רבור (Lonely Mountain) ההר הבודד
Haitian Creole Mòn sèl
Hindi सुुनसान पर्वत
Hmong Roob kho siab
Hungarian Magányos Hegy
Icelandic Einmanna fjall
Indonesian Gunung Sunyi
Irish Gaelic Sliabh Uaigneach
Italian Montagna Solitaria
Japanese 孤独な山 (Lonely Mountain) エレボール (Erebor)
Kannada ಲೋನ್ಲಿ ಮೌಂಟೇನ್
Kazakh жалғыз тау (Cyrillic) Jalğız taw (Latin)
Korean 외로운 산/에레보르 (Lonely Mountain) 에레보르 (Erebor)
Kurdish شاخی تەنیا (Sorani) Çiya bi tenę (Kurmanji)
Kyrgyz Cyrillic жалгыз тоо
Laotian ພູເຂົາເປົ່າປ່ຽວດຽວດາຍ
Latin Mons Solus
Latvian Vientuļais Kalns
Lithuanian Vienišąjį Kalną
Macedonian Cyrillic Осамена Планина
Maori Maunga Mokemoke
Malaysian Gunung Sepi
Maltese Solitarju Muntanja
Marathi एकाकी डोंगरावर
Mongolian Cyrillic ганцаардаж уулын
Nepalese एक्लो पहाड
Norwegian Ensomfjellet
Occitan Montanha Solitària
Persian اره بور (Erebor) کوه تنهایی (Lonely Mountain)
Polish Samotna Góra
Portuguese (Brazil and Portugal) Montanha Solitária
Punjabi ਇਕੱਲੇ ਪਹਾੜੀ
Romanian Muntele Singuratic
Romansh Muntogna Solitari
Russian Одинокая Гора
Scottish Gaelic Aonaranach Bheinn
Serbian Самотна планина (Cyrillic) Samotna planina (Latin)
Slovenian Osamljena Gora
Slovak Osamelý hora
Shona Shurikirwa Gomo
Sindhi اڪيلو جبل
Sinhalese හුදකලා ගිරිය
Somalian Cidlo Buurta
Spanish Montaña Solitaria
Swedish Ensamma Berget
Tajik Cyrillic бекас Маунтин
Tamil லோன்லி மலை
Telugu లోన్లీ మౌంటైన్
Thai ภูเขาโลนลี่ (Lonely Mountain) เอเรบอร์ (Erebor)
Turkish Yalnız dağ
Ukrainian Cyrillic Самотня гора (Lonely Mountain) Еребор (Erebor)
Urdu تنہا پہاڑ
Uzbek Лонелй Моунтаин (Cyrillic) Yolg'iz tog ' (Latin)
Vietnamese Ngọn Cô Độc
Welsh Mynydd Unig
Yiddish עלנט באַרג
Dwarven realms of Middle-earth throughout the Ages
Years of the Trees and First Age Amon Rûdh | Belegost | Khazad-dûm | Mount Gundabad | Nogrod | Narukuthûn | 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 | Iron Hills


  1. 1.0 1.1 The Lord of the Rings, Appendix B: The Tale of Years (Chronology of the Westlands), "The Second Age"
  2. The Lord of the Rings, Appendix A, "Durin's Folk"
  3. Unfinished Tales of Númenor and Middle-earth, Part Three: The Third Age, Chapter Three: "The Quest of Erebor"