Death of Finrod (465 Y.S.) - King Finrod Felagund, son of Finarfin, swore an oath to aid Barahir or any of his kin after Barahir saved his life at Dagor Bragollach.  And so when Beren, son of Barahir, was charged by Thingol with the quest of retreiving one of the Silmarils from Morgoth in order to win the hand of Lúthien Tinúviel, Finrod honored his vow and accompanied Beren to Angband.  Unfortunately, he would not make it out alive.  They were captured by Sauron, Morgoth's top lieutenant, and taken to his island, Tol Sirion.

"In the pits of Sauron Beren and Felagund lay, and all their companions were now dead; but Sauron proposed 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." ~The Silmarillion, chap. 19 (Of Beren and Lúthien)