
The short answer is: the dwarven Kingdom Under The Mountain was originally ruled from Moria, which the dwarves called Khazad-dûm. However, I suspect your confusion stems from the fact that the dwarves were evicted from both places, and want to retake both places, just for different reasons. Erebor and Moria are two completely different places. As told by Tolkien in The Hobbit, it took many days to find the door, and luckily for Thorin and Company they did not arrive on Durin's day so they had plenty of time to enter the mountain.I have not seen the second or third Hobbit movies, but if they claimed that Smaug was "in" Moria and needed to be evicted, that would appear to be a mistake. 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. In TA 2941, Bilbo Baggins and Thorin's company traveled to the Lonely Mountain to regain the treasure Smaug had stolen. This is told in detail in The Quest of Erebor and described by Tolkien's song, "Far Over the Misty Mountains Cold". For many years thereafter the Dwarves lived in exile in the Blue Mountains until, by a seemingly chance meeting, Gandalf the Greymet Thorin Oakenshield and together they planned to reclaim the mountain. While Thorin Oakenshield was out hunting one day in TA 2770, Smaug came from the mountains and invaded the Lonely Mountain, hoarding all its wealth for himself. Thráin IIand several companions escaped by a secret door. The Dwarves went their separate ways with Grórand his followers settling in the Iron Hills and Thrór and his followers settling in the Lonely Mountain. However, the Dwarves of the Grey Mountains began experiencing attacks by the dragons that still lived in those mountains, and became embroiled in a costly war against them, forcing the Dwarves to abandon the Grey Mountains in TA 2590.

Thrain I used the Arkenstone as a symbol of his rule, and his sons and grandsons under him who were to follow.įor two-hundred and eleven years the kingdom advanced, expanded, prospered, and endured until Thorin I abandoned it to join his kin in the Grey Mountains, and the Lonely Mountain was abandoned for three-hundred and eighty years. In this time, the Dwarves became very rich and amassed a large amount of gold and treasure which included the jewel known as the Arkenstone. By TA 1999, it had become a Dwarven stronghold, where the Dwarves became a numerous and prosperous people. The survivors under Thráin I followed him to the Lonely Mountain and the colony became the ancestral home of the King under the Mountain. The Dwarves have lived and mined in the mountain during the Second Age, but it wasn't until the mid-Third Age that the colony had become a firmly established Kingdom of the Longbeards, after the fall of the ancient Kingdom of Khazad-dûm due to the awakening of a Balrog (who was later known as Durin's Bane) in TA 1981. A mining colony was soon set up and a road was laid out to connect the Dwarves to their great cities from the Iron Hills and as far west as their realms and possessions in the Blue Mountains. The Dwarves of Durin's Folk discovered the mineral wealth of the Lonely Mountain sometime after the awakening of the first Durin. The mountain was named "Erebor" in Sindarin.


It was located in northeast of Rhovanion, and was the source of the River Running. For the latter half of the Third Age, the Lonely Mountain was the greatest city in Middle-earth.
