Aranrúth - Also known as "King's Ire", it was the sword wielded by Thingol of the Sindar.  After his death, it would be passed down to his successors (Unfinished Tales, Part 2, chap. I).

     "'I ask then for a sword of worth,' said Beleg; 'for the Orcs come now too thick and close for a bow only, and such blade as I have is no match for their armour.'
     'Choose from all I have,' said Thingol, 'save only Aranrúth, my own.'" ~The Silmarillion, chap. 21 (Of Túrin Turambar)