The sword of Elendil, broken at Orodruin. Originally forged in the FirstAge by Telchar, a Dwarf, the most renowned smith from Nogrod.

Reforged after the Council of Elrond in the ThirdAge by the Elves of Rivendell, new name: Andúril, Flame of the West.

From the dream of Boromir:

Seek for the sword that was broken:

In Imladris it dwells;

There shall be counsels taken

Stronger than Morgul-spells.

There shall be shown a token

That Doom is near at hand,

For Isildurs Bane shall waken,

And the Halfling forth shall stand.

Narsil was originally forged for Elendil, by Telchar the Dwarf. It was borne by Elendil in the Last Alliance and broken under him as he fell, slain by Sauron. Isildur recoverd the shards of the sword after the battle. The shards were taken to Rivendell and not disturbed for some time after the disaster of the Gladden Fields. Apparently...

After being reforged, Andúril's appearance is described: on its blade was traced a device of seven stars set between the crescent Moon and the rayed Sun, and about them were written many runes; . . . Very bright was that sword when it was made whole again; the light of the sun shone redly in it, and the light of the moon shone cold, and its edge was hard and keen.

The Last Alliance

The Warg Attack On The Fellowship

Battle at Amon Hen

Helm's Deep

Capture Of The Corsair Fleet

Pelennor Fields

Slag Hills