The Silmarillion

Then by the advice of Felagund Beor gathered all the wandering families and kindreds of his people, and they removed over Gelion, and took up their abode in the lands of Amrod and Amras, upon the east banks of the Celon south of Nan Elmoth, near to the borders of Doriath; and the name of that land thereafter was Estolad, the Encampment. But when after a year had passed Felagund wished to return to his own country, Beor begged leave to come with him; and he remained in the service of the King of Nargothrond while his life lasted. In this way he got his name, Beor, whereas his name before had been Balan; for Beor signified 'Vassal' in the tongue of his people. The rule of his folk he committed to Baran his elder son; and he did not return again to Estolad.

Soon after the departure of Felagund the other Men of whom Beor had spoken came also into Beleriand. First came the Haladin; but meeting the unfriendship of the Green-elves they turned north and dwelt in Thargelion, in the country of Caranthir son of Feanor; there for a time they had peace, and the people of Caranthir paid little heed to them.

In the next year Marach led his people over the mountains; they were a tall and warlike folk, marching in ordered companies, and the Elves of Ossiriand hid themselves and did not waylay them. But Marach, hearing that the people of Beor were dwelling in a green and fertile land, came down the Dwarf-road, and settled in the country south; and east of the dwellings of Baran son of Beor; and there was great friendship between those peoples.

Felagund himself often returned to visit Men; and many other Elves out of the west-lands, both Noldor and Sindar, Journeyed to Estolad, being eager to see the Edain, whose coming had long been foretold. Now Atani, the Second People, was the name given to Men in Valinor in the lore that told of their coming; but in the speech of Beleriand that name became Edain, and it was there used only of the three kindreds of the Elf-friends.

Fingolfin, as King of all the Noldor, sent messengers of welcome to them; and then many young and eager men of the Edain went away and took service with the. kings and lords of the Eldar. Among them was Malach son of Marach, and he dwelt in Hithlum for fourteen years; and he learned the Elven-tongue and was given the name of Aradan.

The Edain did not long dwell content in Estolad, for many still desired to go westward; but they did not know the way. Before them lay the fences of Doriath, and southward lay Sirion and its impassable fens. Therefore J the kings of the three houses of the Noldor, seeing hope t of strength in the sons of Men, sent word that any of the Edain that wished might remove and come to dwell among their people. In this way the migration of the Edain began: at first little by little, but later in families and kindreds, they arose and left Estolad, until after some fifty years many thousands had entered the lands of the Kings. Most of these took the long road northwards, until the ways became well known to them. The people of Beor came to Dorthonion and dwelt in lands ruled by the house of Finarfin. The people of Aradan (for Marach his father remained in Estolad until his death) for the most part went on westward; and some came to Hithlum, but Magor son of Aradan and many of the people passed down Sirion into Beleriand and dwelt a while in the vales of the southern slopes of Ered Wethrin.

It is said that in all these matters none save Finrod Felagund took counsel with King Thingol, and he was ill pleased, both for that reason, and because he was troubled by dreams concerning the coming of Men, ere ever the first tidings of them were heard. Therefore he commanded that Men should take no lands to dwell in save in the north, and that the princes whom they served should be answerable for all that they did; and he said: 'Into Doriath shall no Man come while my realm lasts, not even those of the house of Beor who serve Finrod the beloved.' Melian said nothing to him at that time, but afterwards she said to Galadriel: 'Now the world runs on swiftly to great tidings. And one of Men, even of Beor's house, shall indeed come, and the Girdle of Melian shall not restrain him, for doom greater than my power shall send him; and the songs that shall spring from that coming shall endure when all Middle-earth is changed.'

But many Men remained in Estolad, and there was still a mingled people living there long years after, until in the ruin of Beleriand they were overwhelmed or fled back into the East. For beside the old who deemed that their wandering days were over there were not a few who desired to go their own ways, and they feared the Eldar and the light of their eyes; and then dissensions awoke among the Edain, in which the shadow of Morgoth may be discerned, for certain it is that he knew of the coming of Men into Beleriand and of their growing friendship with the Elves.

The leaders of discontent were Bereg of the house of Beor, and Amlach, one of the grandsons of Marach; and they said openly: 'We took long roads, desiring to escape the perils of Middle-earth and the dark things that dwell there; for we heard that there was Light in the West. But now we learn that the Light is beyond the Sea. Thither we cannot come where the Gods dwell in bliss. Save one; for the Lord of the Dark is here before us, and the Eldar, wise but fell,  who make endless war upon him. In the North he dwells, they say; and there is the pain and death from which we fled.

We will not go that way.'

Then a council and assembly of Men was called, and great numbers came together. And the Elf-friends answered Bereg, saying: 'Truly from the Dark King come all the evils from which we fled; but he seeks dominion over all Middle-earth, and whither now shall we turn and he will not pursue us? Unless he be vanquished here, or at least held in leaguer. Only by the valour of the Eldar is he restrained, and maybe it was for this purpose, to aid them at need, that we were brought into this land.'

To this Bereg answered: 'Let the Eldar look to it! Our lives are short enough.' But there arose one who seemed to all to be Amlach son of Imlach, speaking fell words that shook the hearts of all who heard him: 'All this is but Elvish lore, tales to beguile newcomers that are unwary. The Sea has no shore. There is no Light in the West. You have followed a fool-fire of the Elves to the end of the world! Which of you has seen the least of the Gods? Who has beheld the Dark King in the North? Those who seek the dominion of Middle-earth are the Eldar. Greedy for wealth they have delved in the earth for its secrets and have stirred to wrath the things that dwell beneath it, as they have ever done and ever shall. Let the Orcs have the realm that is theirs, and we will have ours. There is room in the world, if the Eldar will let us be!'

Then those that listened sat for a while astounded, and a shadow of fear fell on their hearts; and they resolved to depart far from the lands of the Eldar. But afterwards Amlach returned among them, and denied that he had been present at their debate or had spoken such words as they reported; and there was doubt and bewilderment among Men.