Who is Felagund from The Silmarillion and what is their importance?

King Felagund is born Finrod, the eldest son of Finarfin. He is often called the Faithful and the Friend of Men. After he founds Nargothrond, he becomes known as King Felagund. Barahir rescues Felagund in the Dagor Bragollach, and Felagund pays his debt by accompanying Beren on his quest to retrieve a Silmaril, during which Felagund is slain in Morgoth's dungeons.