

They eventually made their way to the Lonely Mountain, Erebor, and set up a new kingdom "in exile" there. All of the dwarves we ever see in the movies are members of Durin's clan, which was originally ruled by the King under the Mountain, from within Khazad-dûm.Ībout 1000 years before the events of The Hobbit, the dwarf miners in Khazad-dûm released a dangerous creature - the Balrog seen the Fellowship of the Ring - and the dwarves were all forced to flee. Tolkien claimed there were 7 clans, though I believe only 3 are ever named. It's more properly called Khazad-dûm, and was the ancient home of the clan of dwarves that were descended from Durin.


Moria is a vast complex of caves, mines, and tunnels under the Misty Mountains. Later, when the dragon Smaug came and took over Erebor, and drove the dwarves out again, some of them tried to move back into Moria and reclaim it - not from Smaug, but from the orcs that had taken up residence there. Many of them settled in the mountain called Erebor, the Lonely Mountain, and reformed their kingdom there. At some point, the dwarves accidentally released a monster into Khazad-dûm, and were forced to flee. 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. 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.
