Dior Eluchíl:

Dior was the son of Lúthien Tinúviel and Beren.Among his children was Elwing, who helped Eärendil in his quest to ask the Valar for aid. Eventually, Dior was the ruler in Mengroth. There he was slain by Celegorm, Curufin and Caranthir, as he was in posession of the silmaril regained by his father, Beren. However, before he died, he was able to kill the three sons of Fëanor.