Valyrian Steel

Valyrian steel was invented in Valyria, and was used to make weapons and various other items of unparalleled quality. Magic and spells play a role in its forging, which makes the steel special and gives it magical characteristics.

The forging process of Valyrian steel was lost in the Doom, but some houses both in Essos and Westeros still hold Valyrian steel ancestral weapons. More still are scattered, lost, around the world, waiting to be found. These weapons are among the most prestigious possessions of a noble house, in terms of weapons only surpassed by Dawn, the legendary greatsword of House Dayne.

The North

 * Ice, the ancestral greatsword of House Stark.
 * Longclaw, the ancestral bastard sword of House Mormont.

The Vale

 * Lady Forlorn, the ancestral longsword of House Corbray.
 * Tidecaller, the ancestral trident of House Upcliff.

The Westerlands

 * Red Rain, the ancestral longsword of House Reyne. Once owned by House Drumm.

The Iron Islands

 * Nightfall, the ancestral bastard sword of House Harlaw.

The Riverlands

 * Piety, the ancestral longsword of House Blackwood.

The Crownlands

 * Crab's Pincer, the ancestral axe of House Celtigar.
 * Blackfyre, the ancestral bastard sword of House Targaryen.

The Stormlands

 * Maelstrom, the ancestral flail of House Wylde.

The Reach

 * Heartsbane, the ancestral greatsword of House Tarly.
 * Orphan-Maker, the ancestral longsword of House Peake. Once owned by House Roxton.

Dorne

 * Dawn, the ancestral greatsword of House Dayne. Though not Valyrian steel, many consider the star-forged weapon to be equal to any Heartsbane or Blackfyre.

Lost Valyrian Steel

 * Brightroar, the ancestral greatsword of House Lannister. Lost by King Tommen II Lannister after sailing to Valyria never to return.
 * Lamentation, the ancestral greatsword of House Royce. Torn from the body of Ser Willam Royce during the Storming of the Dragonpit.
 * Truth, the ancestral longsword of the Rogare family, last wielded by Moredo Rogare.
 * Vigilance, the ancestral longsword of House Hightower. Lost after Lord Ormund Hightower was slain by Roddy the Ruin at the Battle of Tumbleton.
 * Dark Sister, the ancestral longsword of House Targaryen. Last wielded by Brynden "Bloodraven" Rivers beyond the Wall.