Love of Finrod Felagund - Finrod and Amárië.
(108) "About this time it is recorded that Nargothrond was full-wrought, and Finarfin's sons were gathered there to a feast and Galadriel came from Doriath and dwelt there a while. Now King Finrod Felagund had no wife, and Galadriel asked him why this was; but foresight came upon Felagund as she spoke, and he said: `An oath I too shall swear, and must be free to fulfill it and go into darkness. Nor shall anything of all my realm endure that a son should inherit.'"
(109) "But it is said that not until that hour had such cold thoughts ruled him; for indeed she whom he had loved was Amárië of the Vanyar, and she was not permitted to go with him into exile."
Later in the Year of the Sun 465 it is said that:
(180) "King Finrod Felagund and Beren set forth, with ten companions only, and went northward; but they were waylaid by Sauron and cast into a pit in Tol-in-Gaurhoth. There they were devoured one by one by wolves; but Felagund fought the wolf that was sent to devour Beren, and slew it, and was slain. Thus perished from Middle-earth the fairest of the children of Finwë, and returned never again; but dwells now in Valinor with Amárië."
In Version II (199) it is said that `released soon from Mandos, he went to Valinor and there dwells with Amárië.'