Shards of Narsil
At the end of the Second Age, Elendil's great sword Narsil was already an ancient and famous weapon, forged more than three millennia earlier by the Telchar of Nogrod. In the War of the Last Alliance, Elendil fell, and his sword was broken, but its remains were brought to the North-kingdom. These shards were carried by Elendil's heirs throughout the Third Age, as a token of their ancestry, until the time of the War of the Ring. The shards were reforged by the smiths of Rivendell into Aragorn's sword Andúril.