The Silmarillion

In that wood in ages past Melian walked in the twilight of Middle-earth when the trees were young, and enchantment lay upon it still. But now the trees of Nan Elmoth were the tallest and darkest in all Beleriand, and there the sun never came; and there Eöl dwelt, who was named the Dark Elf. Of old he was of the kin of Thingol, but he was restless and ill at ease in Doriath, and when the Girdle of Melian was set about the Forest of Region where he dwelt he fled thence to Nan Elmoth. There he lived in deep shadow, loving the night and the twilight under the stars. He shunned the Noldor, holding them to blame for the return of Morgoth, to trouble the quiet of Beleriand; but for the Dwarves he had more liking than any other of the Elvenfolk of old. From him the Dwarves learned much of what passed in the lands of the Eldar.

Now the traffic of the Dwarves down from the Blue Mountains followed two roads across East Beleriand, and the northern way, going towards the Fords of Aros, passed nigh to Nan Elmoth; and there Eöl would meet the Naugrim and hold converse with them. And as their friendship grew he would at times go and dwell as guest in the deep mansions of Nogrod or Belegost There he learned much of metalwork, and came to great skill therein; and he devised a metal as hard as the steel of the Dwarves, but so malleable that he could make it thin and supple; and yet it remained resistant to all blades and darts. He named it galvorn, for it was black and shining like jet, and he was clad in it whenever he went abroad. But Eöl, though stooped by his smithwork, was no Dwarf, but a tall Elf of a high kin of the Teleri, noble though grim of face; and his eyes could see deep into shadows and dark places. And it came to pass that he saw Aredhel Ar-Feiniel as she strayed among the tall trees near the borders of Nan Elmoth, a gleam of white in the dim land. Very fair she seemed to him, and he desired her; and he set his enchantments about her so that she could not find the ways out, but drew ever nearer to his dwelling in the depths of the wood. There were his smithy, and his dim halls, and such servants as he had, silent and secret as their master. And when Aredhel, weary with wandering, came at last to his doors, he revealed himself; and he welcomed her, and led her into his house. And there she remained; for Eöl took her to wife, and it was long ere any of her kin heard of her again.

It is not said that Aredhel was wholly unwilling, nor that her life in Nan Elmoth was hateful to her for many years. For though at Eöl's command she must shun the sunlight, they wandered far together under the stars or by the light of the sickle moon; or she might fare alone as she would, save that Eöl forbade her to seek the sons of Fëanor, or any others of the Noldor. And Aredhel bore to Eöl a son in the shadows of Nan Elmoth, and in her heart she gave him a name in the forbidden tongue of the Noldor, Lómion, that signifies Child of the Twilight; but his father gave him no name until he was twelve years old. Then he called him Maeglin, which is Sharp Glance, for he perceived that the eyes of his son were more piercing than his own, and his thought could read the secrets of hearts beyond the mist of words.

As Maeglin grew to full stature he resembled in face and form rather his kindred of the Noldor, but in mood and mind he was the son of his father. His words were few save in matters that touched him near, and then his voice had a power to move those that heard him and to overthrow those that withstood him. He was tall and black-haired; his eyes were dark, yet bright and keen as the eyes of the Noldor, and his skin was white. Often he went with Eöl to the cities of the Dwarves in the east of Ered Lindon, and there he learned eagerly what they would teach, and above all the craft of finding the ores of metals in the mountains.

Yet it is said that Maeglin loved his mother better, and if Eöl were abroad he would sit long beside her and listen to all that she could tell him of her kin and their deeds in Eldamar, and of the might and valour of the princes of the House of Fingolfin. All these things he laid to heart, but most of all that which he heard of Turgon, and that he had no heir; for Elenwë his wife perished in the crossing of the Helcaraxë, and his daughter Idril Celebrindal was his only child.