Dwarves of the Lonely Mountain
Durin’s Folk, the Longbeards, claim the mountains on three sides of Rhovanion: the Misty Mountains southwards to Khazad-dûm, the Grey Mountains eastwards from Mount Gundabad, and south of there the Lonely Mountain of Erebor and the Iron Hills, with the halls of Barukkhizdín. In Khazad-dûm, the greatest ever dwarven mansion, the Longbeards discovered and delved the fabulous mithril, found nowhere else in all of Middle-earth.
With the coming of Smaug many Longbeards dispersed: to the Iron Hills, to Dunland for a time or to the dwarves of the Blue Mountains west of the Shire. Many became traders, travelling masons or metalworkers.
After the death of Smaug, Dáin II Ironfoot came west from the Iron Hills to reign as the new King Under the Mountain, and dwarves came from far and wide to play a part in his reborn
Personality & Physical Description:
Durin woke alone, and his House was drawn from those he attracted to him from the other Houses. Their unique status as scions of the first Dwarf set the Longbeards apart. Their stock being drawn from all the other Houses, the Longbeards unified all the traits of dwarvishness in one line, but some individuals might always occasionally resemble members of the other kindreds. The Longbeard way is, as their name indicates, to grow their beards as long as they may, and they often wear them forked or plaited.
Whilst the different Houses each gave greater honour to one craft or another, the Line of Durin were unique in having learned to work the mithril that they found in the deeps of Khazad-dûm, and were as a result of that also the only ones to have learned some of the art and lore of the mighty Noldor Elves of Eregion, their westerly neighbours in the Second Age.
The Longbeards, though the proudest of the seven kindreds, were also the wisest and the most farseeing. They are the longest-lived of the Houses, and deem the shorter spans of their cousins an indication of lesser nobility. Their pride and sense of primacy gave them, when straitened such as by the loss of Khazad-dum or the depredations of Smaug, a drive that bordered on desperation.
The House of Durin deem themselves the noblest of the Dwarves. They have long had Firebeards and Broadbeams amongst them on good terms, since ill fate befell those Houses and many sought a home in Khazad-dûm. And indeed the with the Coming of Smaug the favour was returned as many of Thorin’s folk joined the remnants of those Houses in the Blue Mountains.
In ancient times, and in the Lonely Mountain before the coming of Smaug, the Longbeards were allied with nearby Northmen to great mutual benefit. Though such trust has waxed and waned and generally become rare in Middle-earth, with the death of Smaug and the refounding of Dale, they are once again on excellent terms with their Mannish neighbours. The example of Bilbo Baggins has caused them to have a certain special appreciation for the hobbits of the distant Shire. And despite the deep-rooted differences between them, the recent Battle of the Five Armies brought at least renewed contact of sorts with the Wood-elves of Mirkwood.