Who is Saeros from Unfinished Tales of Numenor and Middle-earth and what is their importance?

Saeros is the only elf in Thingol's court that does not get along with Turin in "The Tale of the Children of Hurin." Saeros eventually challenges Turin who easily overpowers him. Saeros flees through the woods and jumps to his death rather than facing Turin. It is because of this event that Turin leaves Doriath, never to return.