Glamdring was the sword once borne by Turgon, King of Gondolin. The sword, decorated with jewels and ruelbone, had passed into legend by the time Gandalf discovered it in a Troll's cave, nearly 6,500 years later. He would use the sword during the Battle of Five Armies and the War of the Ring.
"'Faithless is he that says farewell when the road darkens,' said Gimli. 'Maybe,' said Elrond, 'but let him not vow to walk in the dark, who has not seen the nightfall.'"