ValandilValandil - After the Disaster of the Gladden Fields, Valandil was the only surviving son of Isildur.  He was too young to travel with his father, and so was left behind in Rivendell.  As such, he became Isildur's heir and eventually King of Arnor.

 

"Only three of his people came ever back over the mountains after long wanderings; and of these one was Othar his (Isildur's) esquire, to whose keeping he had given the shards of the sword of Elendil.

 

"Thus Narsil came in due time to the hand of Valandil, Isildur's heir, in Imladris; but the blade was broken and its light was extinguished, and it was not forged anew.  And Master Elrond foretold that this would not be done until the Ruling Ring should be found again and Sauron should return; but the hope of Elves and Men was that these things might never come to pass.

 

"Valandil took up his abode in Annúminas, but his folk were diminished, and of the Númenóreans and of the Men of Eriador there remained now too few to people the land or to maintain all the places that Elendil had built..." ~The Silmarillion (Of the Rings of Power and the Third Age)