Lonely Mountain: Difference between revisions

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{{cleanup}}
{{disambig-more|Lonely Mountain|[[Lonely Mountain (disambiguation)]]}}
{{disambig-more|Lonely Mountain|[[Lonely Mountain (disambiguation)]]}}
{{kingdom
{{kingdom
| image = [[Image:Rob Alexander - The Lonely Mountain.jpg|250px]]
| image=[[File:Jef Murray - The Lonely Mountain 2.jpg|250px]]
| name = Erebor
| name=Lonely Mountain
| meaning = Lonely Mountain
| meaning=
| type = Monarchy/Lordship
| type=Monarchy/Lordship
| hidep=yes
| hidep=yes
| headofstate = [[King under the Mountain]]/[[King of Durin's folk]]
| headofstate=[[King under the Mountain]]/[[King of Durin's folk]]
| executive =  
| executive=
| legislative =  
| legislative=
| judicial =  
| judicial=
| capital =  
| capital=
| language = [[Westron]], [[Khuzdul]]  
| language=[[Westron]], [[Khuzdul]]
| location = North of [[Esgaroth]], west of the [[Iron Hills]],
| location=North of [[Lake-town|Esgaroth]], west of the [[Iron Hills]]
| populace= Dwarves
| populace=[[Dwarves]]
| currency =  
| currency=
| religious =  
| religious=
| holiday =  
| holiday=
| anthem =  
| anthem=
| formed = Part of the Exiled [[Dwarves of the Grey Mountains]] led by King [[Thrór]] in [[Third Age 2590|T.A. 2590]]
| formed=Part of the exiled [[Dwarves of the Grey Mountains]] led by King [[Thrór]]
| established = [[Third Age 2590|T.A. 2590]]
| established={{TA|1999}}
| reorganized =  
| reorganized=
| fragmented =  
| fragmented=
| dissolved = [[Third Age 2770 | T.A. 2770]]
| dissolved={{TA|2770}}
| restored = [[Third Age 2941 | T.A. 2941]]
| restored={{TA|2941}}
}}{{Pronounce|Erebor.mp3|Ardamir}}
}}{{Pronounce|Erebor.mp3|Ardamir}}
'''Erebor''', or the '''Lonely Mountain''' (which it translates as from [[Sindarin]]), was a mountain in the northeast of [[Rhovanion (region)|Rhovanion]]. It was the source of the river [[Running]], and a major [[Dwarves|Dwarven]] [[Dwarf realms|stronghold]] at the end of the [[Third Age]] and well into the [[Fourth Age|Fourth]].
'''Lonely Mountain''', or '''Erebor''', was a mountain in the north-east of [[Rhovanion (region)|Rhovanion]]. It was the source of the river [[River Running|Running]], and a major [[Dwarves|Dwarven]] [[Dwarf realms|stronghold]] at the end of the [[Third Age]] and well into the [[Fourth Age|Fourth]].


==History==
==History==
===[[Years of the Trees]] and the [[First Age]]===
===[[Years of the Trees]] and the [[First Age]]===
 
The Lonely Mountain was first discovered and colonized by the [[Longbeards]] some time after [[Durin|Durin I]] awoke in [[Mount Gundabad]].{{fact}} It was inhabited by a mining colony for thousands of years, and was connected by the [[Forest Road]]; Which was built by the Dwarves to connect all of its mining colonies. It ran from the [[High Pass]] through [[Mirkwood|Greenwood the Great]] (later called Mirkwood) to the river [[River Running|Running]] which ran all the way up to the [[Iron Hills]].
Erebor was first discovered and colonized by the [[Longbeards]] some time after [[Durin|Durin I]] awoke in [[Mount Gundabad]]. It was inhabited by a mining colony for thousands of years, and was connected by the [[Forest Road]]; Which was built by the Dwarves to connect all of its mining colonies. It ran from the [[High Pass]] through [[Mirkwood|Greenwood the Great]] (Later called Mirkwood) to the river [[Running]] that went all the way up to the [[Iron Hills]], which was east of Erebor.


===From Colony to Capital===
===From Colony to Capital===
It continued as a colony for millennia, until the awakening of [[Durin's Bane]] in the capital of [[Khazad-dûm]].


Erebor continued as a colony for millenia, until the awakening of [[Durin's Bane]] in the capital of [[Khazad-dûm]].  In [[Third Age 1980 | T.A.1980]],  King [[Durin VI]] was killed by the creature, and in [[Third Age 1981 | 1981]] after the death of Durin's oldest son and heir King [[Náin I]]; the next in line [[Thráin I]] with the rest of his people fled Khazad-dùm (Renamed Moria). 
Thráin, with those who would follow him, went to the colony in the Lonely Mountain in {{TA|1999}}. Where he established the [[Kingdom under the Mountain]], and relocated the capital of the [[Longbeards]]. Under Thráin's rule the [[Arkenstone]] was discovered, and many riches were mined from its depths; After Thráin's death and his son [[Thorin I]] had ruled for ten years, he abandoned the Mountain in {{TA|2210}} for the [[Grey Mountains]]; where his people were now gathering.
Thráin with those who would follow him, went to the colony in Erebor in [[Third Age 1999 | 1999]]. Where he made himself [[King under the Mountain]], and relocated the capital of the Longbeards.
Under Thráin's rule the [[Arkenstone]] was discovered, and many riches were mined from its depths; After Thráin's death and his son [[Thorin I]] had ruled in Erebor for ten years, he abandoned the mountain in [[Third Age 2210 | 2210]] for the [[Grey Mountains]]; where his people were now gathering.


===Decline===
The mountain was once again a colony, and its status as capital city was transferred to the [[Ered Mithrin]]. However in the later years they were involved in the [[War of the Dwarves and Dragons]]. As a result, in {{TA|2590}} the now king Thrór, led a group back to the Lonely Mountain. Under Thrór's rule the Lonely Mountain once again became the capital of Durin's folk and they prospered.


After King Thorin left the mountain was once again a colony, and its status as capital city was transfered to the Ered Mithrin.
It wasn't long before the great dragon [[Smaug]] heard of their great wealth, and one day decided to take their treasure for himself. In the year {{TA|2770}} Smaug descended on the mountain in a ball of fire. He killed a large amount of the Dwarves living in the mountain. Most of the survivors fled to the Iron Hills, others went with the royal family into exile, and some simply went their own way.


It was nearly four hundred years before Durin's folk returned in mass to Erebor.  The reason for this being that the [[Dwarves of the Grey Mountains]] had been fighting a [[War of the Dwarves and Dragons |war]] against the [[Dragons]], who had plagued the Dwarves for hundreds of years. In the year  [[Third Age 2590 | 2589]] King [[Náin II]] and middle son [[Frór]] were killed by a great [[Cold-drake]] at the entrance to their halls, which led to the decision by the two remaining heirs, [[Thrór]] and [[Grór]], to leave the mountains with those who wished to follow them. 
The Lonely Mountain was empty for over two hundred years, save the ever vigilant Smaug who slept in the inner most chamber on a great pile of wealth. But while Durin's folk wandered from the mountain to [[Dunland]] to the northern [[Blue Mountains]]; they ever longed for the halls of the Lonely Mountain.
==Reestablishment==
The [[Third Age 2590|following year]] the now king Thrór, led a group back to Erebor, while his borther Grór led another portion to the Iron Hills, and even some stayed behind in the Ered Mithrin.


Thrór eventually made it to Erebor, and declared himself [[King under the Mountain]]. Under Thrór's rule Erebor once again became the capital of Durin's folk, the [[Dwarves of Erebor]] became the best crafters and masons in Wilderland, trade increased with their kinsman  in the Iron Hills and elsewhere, and they also became very rich.
===The Quest of Erebor and restoration===
It wasn't until Thrór's grandson [[Thorin|Thorin II Oakenshield]] met the Wizard [[Gandalf]] that the hopes of retaking the Lonely Mountain seemed possible. Indeed in the year {{TA|2941}} with Gandalf's council, king Thorin and a small company of friends and family actually made it to the Lonely Mountain. After the Dragon Smaug had realized that the Dwarves had been helped by the [[Men of Dale]] he went to their town of [[Lake-town|Esgaroth]] intent on destroying them, only to be killed by a man named [[Bard]]. With the help of a [[Hobbits|Hobbit]] named [[Bilbo Baggins]] Thorin and company were able to retake the city and the treasure, therefore allowing Thorin to proclaim himself King under the Mountain. But after refusing to give any of the treasure to the Men of Esgaroth, and the [[Elves of Mirkwood]], the mountain and the Dwarves and Hobbit in it were put under a bloodless siege.


===[[Sack of Erebor]] and exile===
Things nearly came to blows when Thorin's cousin [[Dáin Ironfoot]] (Grór's grandson) arrived as aid to his kinsman and nearly went to battle against the besiegers. But Gandalf interceded and warned them all of a great host of [[Orcs]] and [[Wargs]] coming to take the mountain. So the Elves, Men, and Dwarves made an alliance, and fought a [[Battle of Five Armies|bloody battle]] against their foes in the valley before the gate. In the end the defenders were victorious against the Orcs and Wargs, but king Thorin was mortally wounded and his nephews were both killed in the battle. After Thorin's death Dáin was made king of Durin's folk and of the mountain. Finally, after so many years of longing, the Longbeards could return to the Lonely Mountain.


But with this new found prosperity came trouble.  it wasn't long before the great dragon [[Smaug]] heard of their great wealth, and one day decided to take their treasure for himself.  in the year [[Third Age 2770 | 2770]] Smaug descended on the mountain in a ball of fire.  He killed King [[Girion]] of [[Dale]] with many of his knights, and he killed a large amount of the Dwarves living in the mountain.  Most of the survivors fled to the Iron Hills, others went with the royal family into exile, and some simply went their own way.
===Prosperity and the [[War of the Ring]]===
Under Dáin's rule the Dwarves of the Lonely Mountain became very rich and prosperous and the Lonely Mountain was restored to its original greatness.  


The Lonely Mountain was empty for over two hundred years, save the ever vigilant Smaug who slept in the inner most chamber on a great pile of wealth.  But while Durin's folk wandered from the mountain to [[Dunland]] to the northern [[Blue Mountains]]; they ever longed for the halls of Erebor.
Many years later, during the [[War of the Ring]], conflict broke out between Dale and the East and eventually Men and Dwarves retreated into the mountain. King [[Brand]] and King Dáin were killed at its very gates. The Dwarves and Men held out for several days until word reached the ears of the Easterlings that the great hosts of Sauron in the south had been defeated in the [[Battle of the Morannon]]. With this news fear fell on the besiegers. When the besieged saw this they came forth from the Lonely Mountain, and attacked their enemy driving them from Dale across the Running.


===The Quest of Erebor and restoration===
Little is known of the reign of [[Thorin Stonehelm|Thorin III Stonehelm]], other than his people helping rebuild the cities of [[Gondor]] and the fortress of [[Helm's Deep]], and part of his people moving to the [[Glittering Caves]].


It wasn't until Thrór's grandson [[Thorin Oakenshield|Thorin II Oakenshield]] met the Wizard [[Gandalf]] that the hopes of retaking Erebor seemed possible.  Indeed in the year [[Third Age 2941 | 2941]] with Gandalf's council, king Thorin and a small company of friends and family actually made it to the Lonely Mountain.  After the Dragon Smaug had realized that the Dwarves had been helped by the [[Men of Dale]]  he went to their town of [[Esgaroth]] intent on destroying them.  Only to be killed by a man named [[Bard I|Bard the Bowman]]. 
==Description==
With the help of a [[Hobbits|Hobbit]] named [[Bilbo Baggins]] Thorin and company were able to retake the city and the treasure.  Therefore allowing Thorin to proclaim himself King under the Mountain.  But after refusing to give any of the treasure to the Men of Esgaroth, and the [[Elves of Mirkwood]], the mountain and the Dwarves and Hobbit in it were put under a bloodless siege.
The Lonely Mountain was possibly 3,500 feet tall, as it was snowcapped at spring. Geologically, it was rich in metals and jewels.<ref>[[Karen Fonstad]] ''[[The Atlas of Middle-earth]]''</ref>
Things nearly came to blows when Thorin's cousin [[Dáin Ironfoot]] (Grór's grandson) arrived as aid to his kinsman and nearly went to battle against the besiegers. But Gandalf interceded and warned them all of a great host of [[Orcs]] and [[Wargs]] coming to take the mountain.  So the Elves, Men, and Dwarves made an alliance, and fought a [[Battle of Five Armies | bloody batte]] against their foes in the valley before the gate of Erebor.


In the end the defenders were victorious against the Orcs and Wargs, but king Thorin was mortally wounded and his nephews were both killed in the battle, and after Thorin's death Dáin was made king of Durin's folk and of the mountain.  Finally after so many years of longing the Longbeards finally  could return to Erebor.
The mountain was star-shaped with six ridges radiating as spurs from the peak.


===Prosperity and the [[War of the Ring]]===
The south-western spur contained [[Ravenhill]] housing a Dwarven guard-post. Between the two western spurs was a narrow vale which was the exit of the [[Back Door]], behind an overhanging cliff. Rough steps ascended to the top of the southern ridge along a narrow ledge turning east behind a boulder into a steep bay.


Under Dáin's rule the Dwarves of Erebor became very rich and prosperous.  They rebuilt the town of [[Dale]], their trade greatly increased with their kinsman in the Iron Hills once again and with Men; and Erebor was restored to its original greatness.
Inside, the mountain was dug with passages and tunnels leading to cellars and halls and mansions such as the great chamber of Thrór near the Front Gate. A secret tunnel led to the "bottommost cellar"
But once again trouble began to brew in the east.  The Men of Dale were nearing war with the [[Easterlings]], and in the year [[Third Age 3019 | 3019]] an emissary from [[Sauron]] came to Erebor and told Dáin that if he were to give up the location of Bilbo (Who had discovered the [[Ring of Power]] in his travels) that Sauron would return to him the three remaining [[Seven Rings|Dwarven rings]].  But being wary of the emissary, Dáin sent his kinsmen [[Glóin (Son of Thorin I)|Glóin]] to [[Rivendell]] to warn Bilbo that Sauron was after him.


Several months later war broke out between Dale and the East.  Dale was driven from their borders at the river Running, and was besieged in their city of Dale for three days in what became the [[Battle of Dale]].  Even with the aid of the Dwarves they could not stop the advance of the Easterlings; and on the third day as the Men and Dwarves retreated into the mountain, King [[Brand]] and King Dáin were killed at the its very gates. The Dwarves and Men held out for several days until word reached the ears of the Easterlings that the great hosts of Sauron in the south had been defeated in the [[Battle of the Morannon]].  With this news fear fell on the besiegers.  When the besieged saw this they came forth from the Erebor, and attacked their enemy driving them from Dale across the Running, never to be bothered again.
The main entrance into the mountain was the [[Gate of Erebor]] on the south side, opening onto a valley between two great spurs of the mountain. At the end of the southwestern spur was [[Ravenhill]], where there was a lookout post. The [[River Running]] sprang from beneath the mountain and issued from the [[Front Gate]], forming a waterfall that fell into the valley below.


After the death of his father, [[Thorin Stonehelm|Thorin III Stonehelm]] became king of Durin's folk, and Erebor. Little is known of his reign other than his people helping rebuild the cities of [[Gondor]] and the fortress of [[Helm's Deep]], and part of his people moving to the [[Glittering Caves]].  Erebor continued to prosper until the world grew old and the races of Durin ended.
Inside the gate was a broad paved road that went alongside the river in a wide curve leading into the mountain. Not very far from the entrance was the [[Great Chamber of Thrór]] where feasts and councils were held.


==Description==
In the Lower Halls, there was a vast chamber called the [[Great Hall of Thráin]] at the root of the mountain. From there a secret passageway led to a hidden door in the western side of the mountain. The [[Back Door]] was invisible from the outside except on Durin's Day, when the light of the setting sun would reveal the keyhole.  
The main entrance into the mountain was the [[Gate of Erebor]] on the south side, opening onto a valley between two great spurs of the mountain. At the end of the southwestern spur was [[Ravenhill]], where there was a lookout post. The River Running sprang from beneath the mountain and issued from the [[Front Gate]], forming a waterfall that fell into the valley below.
Inside the gate was a broad paved road that went alongside the river in a wide curve leading into the mountain. Not very far from the entrance was the Great Chamber of Thror where feasts and councils were held.
In the Lower Halls, there was a vast chamber called the Great Hall of Thráin at the root of the mountain. From there a secret passageway led to a hidden door in the western side of the mountain. The [[Back Door]] was invisible from the outside except on Durin's Day, when the light of the setting sun would reveal the keyhole.  These were the only places talked about in the books.  However the city beneath Erebor was very large with many mines, halls, mansions, etc.


{{references}}
{{references}}
* [[J.R.R. Tolkien]], ''[[The Hobbit]]'', passim.
<small>
* [[J.R.R. Tolkien]], ''[[The Fellowship of the Ring]]'', [[Many Meetings]]
::* [[J.R.R. Tolkien]], ''[[The Hobbit]]'', passim.
* [[J.R.R. Tolkien]], ''[[The Fellowship of the Ring]]'', [[The Council of Elrond]]
::* [[J.R.R. Tolkien]], ''[[The Fellowship of the Ring]]'', [[Many Meetings]]
* [[J.R.R. Tolkien]], ''[[The Return of the King]]'', passim.
::* [[J.R.R. Tolkien]], ''[[The Fellowship of the Ring]]'', [[The Council of Elrond]]
* [[J.R.R. Tolkien]], ''[[The Lord of the Rings]]'', [[Appendix A]]: III Durin's Folk
::* [[J.R.R. Tolkien]], ''[[The Return of the King]]'', passim.
* [[J.R.R. Tolkien]] and [[Christopher Tolkien]] (ed.), ''[[Unfinished Tales]]'', [[The Quest of Erebor]]
::* [[J.R.R. Tolkien]], ''[[The Lord of the Rings]]'', [[Appendix A]]: III Durin's Folk
* [[J.R.R. Tolkien]] and [[Christopher Tolkien]] (ed.), ''[[The Peoples of Middle-earth]]''
::* [[J.R.R. Tolkien]] and [[Christopher Tolkien]] (ed.), ''[[Unfinished Tales]]'', [[The Quest of Erebor]]
[[Category:Cities, Towns and Villages]]
::* [[J.R.R. Tolkien]] and [[Christopher Tolkien]] (ed.), ''[[The Peoples of Middle-earth]]''
[[Category:Dwarven Realms]]
</small>
[[Category:Cities, towns and villages]]
[[Category:Dwarven realms]]
[[Category:Mountains]]
[[Category:Mountains]]
[[Category:Rhovanion]]
[[Category:Rhovanion]]
[[Category:Sieges]]
[[Category:Sieges]]
[[Category:Sindarin Locations]]
[[Category:Sindarin locations]]
[[de:Erebor]]
[[de:Erebor]]
[[fa:تنهاکوه]]
[[fr:encyclo/geographie/reliefs/rhovanion/erebor]]
[[fi:Erebor]]
[[fi:Erebor]]

Revision as of 21:55, 8 February 2013

"I shan't call it the end, till we've cleared up the mess." — Sam
This article or section needs to be cleaned up to conform to a higher standard of article quality.
The name Lonely Mountain refers to more than one character, item or concept. For a list of other meanings, see Lonely Mountain (disambiguation).
Lonely Mountain
Jef Murray - The Lonely Mountain 2.jpg
General information
LocationNorth of Esgaroth, west of the Iron Hills
People
LanguageWestron, Khuzdul

Lonely Mountain, or Erebor, was a mountain in the north-east of Rhovanion. It was the source of the river Running, and a major Dwarven stronghold at the end of the Third Age and well into the Fourth.

History

Years of the Trees and the First Age

The Lonely Mountain was first discovered and colonized by the Longbeards some time after Durin I awoke in Mount Gundabad.[source?] It was inhabited by a mining colony for thousands of years, and was connected by the Forest Road; Which was built by the Dwarves to connect all of its mining colonies. It ran from the High Pass through Greenwood the Great (later called Mirkwood) to the river Running which ran all the way up to the Iron Hills.

From Colony to Capital

It continued as a colony for millennia, until the awakening of Durin's Bane in the capital of Khazad-dûm.

Thráin, with those who would follow him, went to the colony in the Lonely Mountain in T.A. 1999. Where he established the Kingdom under the Mountain, and relocated the capital of the Longbeards. Under Thráin's rule the Arkenstone was discovered, and many riches were mined from its depths; After Thráin's death and his son Thorin I had ruled for ten years, he abandoned the Mountain in T.A. 2210 for the Grey Mountains; where his people were now gathering.

The mountain was once again a colony, and its status as capital city was transferred to the Ered Mithrin. However in the later years they were involved in the War of the Dwarves and Dragons. As a result, in T.A. 2590 the now king Thrór, led a group back to the Lonely Mountain. Under Thrór's rule the Lonely Mountain once again became the capital of Durin's folk and they prospered.

It wasn't long before the great dragon Smaug heard of their great wealth, and one day decided to take their treasure for himself. In the year T.A. 2770 Smaug descended on the mountain in a ball of fire. He killed a large amount of the Dwarves living in the mountain. Most of the survivors fled to the Iron Hills, others went with the royal family into exile, and some simply went their own way.

The Lonely Mountain was empty for over two hundred years, save the ever vigilant Smaug who slept in the inner most chamber on a great pile of wealth. But while Durin's folk wandered from the mountain to Dunland to the northern Blue Mountains; they ever longed for the halls of the Lonely Mountain.

The Quest of Erebor and restoration

It wasn't until Thrór's grandson Thorin II Oakenshield met the Wizard Gandalf that the hopes of retaking the Lonely Mountain seemed possible. Indeed in the year T.A. 2941 with Gandalf's council, king Thorin and a small company of friends and family actually made it to the Lonely Mountain. After the Dragon Smaug had realized that the Dwarves had been helped by the Men of Dale he went to their town of Esgaroth intent on destroying them, only to be killed by a man named Bard. With the help of a Hobbit named Bilbo Baggins Thorin and company were able to retake the city and the treasure, therefore allowing Thorin to proclaim himself King under the Mountain. But after refusing to give any of the treasure to the Men of Esgaroth, and the Elves of Mirkwood, the mountain and the Dwarves and Hobbit in it were put under a bloodless siege.

Things nearly came to blows when Thorin's cousin Dáin Ironfoot (Grór's grandson) arrived as aid to his kinsman and nearly went to battle against the besiegers. But Gandalf interceded and warned them all of a great host of Orcs and Wargs coming to take the mountain. So the Elves, Men, and Dwarves made an alliance, and fought a bloody battle against their foes in the valley before the gate. In the end the defenders were victorious against the Orcs and Wargs, but king Thorin was mortally wounded and his nephews were both killed in the battle. After Thorin's death Dáin was made king of Durin's folk and of the mountain. Finally, after so many years of longing, the Longbeards could return to the Lonely Mountain.

Prosperity and the War of the Ring

Under Dáin's rule the Dwarves of the Lonely Mountain became very rich and prosperous and the Lonely Mountain was restored to its original greatness.

Many years later, during the War of the Ring, conflict broke out between Dale and the East and eventually Men and Dwarves retreated into the mountain. King Brand and King Dáin were killed at its very gates. The Dwarves and Men held out for several days until word reached the ears of the Easterlings that the great hosts of Sauron in the south had been defeated in the Battle of the Morannon. With this news fear fell on the besiegers. When the besieged saw this they came forth from the Lonely Mountain, and attacked their enemy driving them from Dale across the Running.

Little is known of the reign of Thorin III Stonehelm, other than his people helping rebuild the cities of Gondor and the fortress of Helm's Deep, and part of his people moving to the Glittering Caves.

Description

The Lonely Mountain was possibly 3,500 feet tall, as it was snowcapped at spring. Geologically, it was rich in metals and jewels.[1]

The mountain was star-shaped with six ridges radiating as spurs from the peak.

The south-western spur contained Ravenhill housing a Dwarven guard-post. Between the two western spurs was a narrow vale which was the exit of the Back Door, behind an overhanging cliff. Rough steps ascended to the top of the southern ridge along a narrow ledge turning east behind a boulder into a steep bay.

Inside, the mountain was dug with passages and tunnels leading to cellars and halls and mansions such as the great chamber of Thrór near the Front Gate. A secret tunnel led to the "bottommost cellar"

The main entrance into the mountain was the Gate of Erebor on the south side, opening onto a valley between two great spurs of the mountain. At the end of the southwestern spur was Ravenhill, where there was a lookout post. The River Running sprang from beneath the mountain and issued from the Front Gate, forming a waterfall that fell into the valley below.

Inside the gate was a broad paved road that went alongside the river in a wide curve leading into the mountain. Not very far from the entrance was the Great Chamber of Thrór where feasts and councils were held.

In the Lower Halls, there was a vast chamber called the Great Hall of Thráin at the root of the mountain. From there a secret passageway led to a hidden door in the western side of the mountain. The Back Door was invisible from the outside except on Durin's Day, when the light of the setting sun would reveal the keyhole.

References

fa:تنهاکوه