Guilin
From Tolkien Gateway
Guilin was an Elf, probably Noldo, of Nargothrond. He was the father of two sons, Gwindor and Gelmir.
His sons played a great role on the history of the Elves in the late First Age. It was Gwindor's desperation over the torture of his brother that triggered the Nirnaeth Arnoediad[1] and long after that dreadful battle he led Túrin back to Nargothrond, starting a chain of events that would lead to its destruction.[2]
