Dwarves enter Beleriand
Event Type: Cultural/Social
Age: Time of the Trees
... In this time also, it is said among the Sindar, the Naugrim ... came over the mountains into Beleriand and became known to the Elves. Now the Dwarves were great smiths and masons, being indeed (it is believed) brought into being by Aule; yet of old small beauty was in their works. Therefore each people had great profit of the other, though their friendship was ever cool. But at that time no griefs lay between them, and King Thingol welcomed them; and the Longbeards of Belegost aided him in the delving and building of the great halls of Menegroth....
Morgoth's Ring, HoME Vol 10, Part 2, The Annals of Aman
It came to pass during the second age of the captivity of Melkor that Dwarves came over the Blue Mountains of Ered Luin into Beleriand. Themselves they named Khazâd, but the Sindar called them Naugrim, the Stunted People, and Gonnhirrim, Masters of Stone. Far to the east were the most ancient dwellings of the Naugrim, but they had delved for themselves great halls and mansions, after the manner of their kind, in the eastern side of Ered Luin; and those cities were named in their own tongue Gabilgathol and Tumunzahar. To the north of the great height of Mount Dolmed was Gabilgathol, which the Elves interpreted in their tongue Belegost, that is Mickleburg; and southward was delved Tumunzahar, by the Elves named Nogrod, the Hollowbold. Greatest of all the mansions of the Dwarves was Khazâd-dûm...; but it was far off in the Mountains of Mist beyond the wide leagues of Eriador, and to the Eldar came but as a name and a rumour from the words of the Dwarves of the Blue Mountains.
From Nogrod and Belegost the Naugrim came forth into Beleriand; and the Elves were filled with amazement, for they had believed themselves to be the only living things in Middle-earth that spoke with words or wrought with hands, and that all others were but birds and beasts. But they could understand no word of the tongue of the Naugrim, which to their ears was cumbrous and unlovely; and few ever of the Eldar have achieved the mastery of it. But the Dwarves were swift to learn, and indeed were more willing to learn the Elventongue than to teach their own to those of alien race. Few of the Eldar went ever to Nogrod and Belegost, save Eöl of Nan Elmoth and Maeglin his son; but the Dwarves trafficked into Beleriand, and they made a great road that passed under the shoulders of Mount Dolmed and followed the course of the River Ascar, crossing Gelion at Sarn Athrad, the Ford of Stones, where battle after befell. Ever cool was the friendship between the Naugrim and the Eldar, though much profit they had one of the other; but at that time those griefs that lay between them had not yet come to pass, and King Thingol welcomed them. But the Naugrim gave their friendship more readily to the Noldor in after days than to any others of Elves and Men, because of their love and reverence for Aulë; and the gems of the Noldor they praised above all other wealth. In the darkness of Arda already the Dwarves wrought great works, for even from the first days of their Fathers they had marvellous skill with metals and with stone; but in that ancient time iron and copper they loved to work, rather than silver or gold.
The Silmarillion, Quenta Silmarillion, Ch 10, Of the Sindar
Elena Tiriel 14Oct05