The 7 Dwarf Realms - Eastern Dwarfs
The mystery of the distant Dwarfs.
In the long history of Arda and Middle-earth, only 3 of the 7 Dwarf Realms that emerged after the birth of the 7 Dwarf Fathers played an essential role in major historical events.
Of the remaining four kingdoms and clans, little or nothing is known. They do not appear in The Silmarillion, The Lord of the Rings, nor The Hobbit. Tolkien does not speak in other writings about them.
There is not even certainty about their exact location since it is only known that when they were put to sleep and scattered by Äule, the Vala decided that he would lodge them in great mountains in the East.
In the East of Middle-earth, there is only one enormous mountain range: the Orocarni.
Also called the Red Mountains were created immemorial when Melkor destroyed the Two Lamps and broke the symmetry of a primordial Arda. It is interesting to know that the mountain range is located next to the Cuiviénen, where the Elves first awoke. Presumably, the Dwarves had contact with the Avari (the Elves who decided not to go west to Aman).
Although the Dwarves of the East are unknown to the vast majority, it is at least known which clans dwelled in the caves of the Orocarni, a place from which they seem to have hardly left.
In the north, the clans of the Ironfists and the Stiffbeards emerged. Both lines were related, and there is a remote possibility that they participated during the Third Age in the War of the Dwarves and Orcs since it is said that after the call for help from the Longbeards, “Houses of other Fathers” came to their aid and participated in the battle.
It is also possible that the other two clans of the East, the Blacklocks and the Stonefoots, participated in this event. Both dwelt in the central Orocarni region and were related like the northern clans. Little or nothing else is known about them.
It is more than plausible that the all four clans sent some troops to help the Longbeards since it is most likely that they all had a very close commercial and cultural relationship living in the same mountain range. Logic leads us to think that they also made military decisions together.
Undoubtedly, the history of the four clans of Eastern Dwarves is one of the great mysteries of Middle-earth, like Tom Bombadil or the Blue Wizards. Perhaps Tolkien had plans for them, in some revision of his writings that he had in mind (he was constantly revising and rewriting his works), but it is something we will never know.