"Finrod was like his father in fair face and golden hair, and also in noble and generous heart, though he had the high courage of the Noldor and in his youth their eagerness and unrest; and he had also from his Telerin mother a love of the sea and dreams of far lands that he had never seen."
-J.R.R. Tolkien, The Unfinished Tales, p. 240-241.
"Now on a time Finrod and Galadriel his sister were the guests of Thingol their kinsman in Doriath. Then Finrod was filled with wonder at the strength and majesty of Menegroth, its treasuries and armouries and its many-pillared halls of stone; and it came into his heart that he would build wide halls behind ever-guarded gates in some deep and secret place beneath the hills. Therefore he opened his heart to Thingol, telling him of his dreams; and Thingol spoke to him of hte deep gorge of the River Narog, and the caves under the High Faroth in its steep western shore, and when he departed he gave him guides to lead him to that place of which few yet knew. Thus Finrod came to the Caverns of Narog, and began to establish there deep halls and armouries after the fasion of the mansions of Menegroth; and that stronghold was called Nargothrond. In that labour Finrod was aided by the Dwarves of the Blue Mountains; and they were rewarded well, for Finrod had brought more treasures out of Tirion than any other of the princes of the Noldor. And in that time was made for him the Nauglamir, the Necklace of the Dwarves, most renowned of their works in the Elder Days. It was a carcanet of gold, and set therein were gems uncounted from Valinor; but it had a power within it so that it rested lightly on its wearer as a strand of flax, and whatsoever neck it clasped it sat always with grace and loveliness.
There in Nargothrond Finrod made his home with many of his people, and he was named in the tongue of the Dwarves Felagund, Hewer of Caves; and that name he bore thereafter until his end."
-J.R.R. Tolkien, The Silmarillion, p. 114.
The following passage describes the fall of King Finrod Felagund, as he was captured by Sauron along with Beren son of Barahir and imprisoned. "In the pits of Sauron Beren and Felagund lay, and all their companions were now dead; but Sauron purposed to keep Felagund to the last, for he perceived that he was a Noldo of great might and wisdom, and he deemed that in him lay the secret of their errand. But when the wolf came for Beren, Felagund put forth all his power, and burst his bonds; and he wrestled with the werewolf, and slew it with his hands and teeth; yet he himself was wounded to the death. Then he spoke to Beren, saying: 'I go now to my long rest in the timeless halls beyond the seas and the Mountains of Aman. It will be long ere I am seen amoung the Noldor again; and it may be that we shall not meet a second time in death or life, for the fates of our kindreds are apart. Farewell!' He died in the dark, in Tol-in-Gaurhoth, whose great tower he himself had built. Thus King Finrod Felagund, fairest and most beloved of the house of Finwë, redeemed his oath; but Beren mourned beside him in despair."
-J.R.R. Tolkien, The Silmarillion p. 174
