Valyrian steel swords are powerful weapons and invaluable relics, and beyond the ones shown in George R.R. Martin's A Song of Ice & Fire novels and expanded texts like Fire & Blood and The World of Ice & Fire detail the existence of even more.

First, let's consider the Valyrian steel swords we know about. The historic blade of Littlefinger's dragonbone blade, which is featured prominently in Game of Thrones and House of the Dragon.

7 Dark Sister

Last Held By Bryden Rivers

Anyone who's seen House of the Dragon will know of "Dark Sister," which is held in the TV show by Daemon Targaryen. This is one of the two ancestral swords of House Targaryen, forged before Aegon's Conquest. The first known owner was Visenya Targaryen, the older sister and one of the wives of King Aegon I Targaryen, a great warrior in her own right who established the order of the Kingsguard. From Visenya, Dark Sister was ed down to her son, Maegor the Cruel, and then occasionally held by his nephew, Jaehaerys I, who ruled for over five decades.

Bloodraven eventually became Lord Commander of the Night's Watch but disappeared beyond the Wall.

Prince Baelon "the Brave" Targaryen held Dark Sister briefly before it was ed down to Prince Daemon, who wielded the blade during the War for the Stepstones and the Targaryen civil war known as the Dance of the Dragons. Without spoiling Daemon's fate in House of the Dragon, Dark Sister was ed further down throughout the Targaryen dynasty through Prince Aemon the Dragonknight and finally to Lord Brynden Rivers, also known as Bloodraven. Bloodraven eventually became Lord Commander of the Night's Watch but disappeared beyond the Wall. Brynden is commonly believed to have become the Three-Eyed Crow.

Given that the Three-Eyed Crow is a character in A Song of Ice & Fire and The Winds of Winter, Dark Sister seems like one of the most likely Valyrian steel swords to pop up again. It's doubtful that Dark Sister was left behind at Castle Black, so it could be beyond the Wall in the cave where Bran is currently learning from the Three-Eyed Crow. Common theories suggest that it could eventually be obtained by Meera Reed, Arya Stark, or even Jon Snow.

6 Lamentation

Last Held By Willam Royce

"Lamentation" was the Valyrian steel sword of House Royce, one of the vassals of House Arryn of the Vale. The Royces are represented in Game of Thrones and A Song of Ice & Fire primarily by Ser Waymar Royce, the knight of the Night's Watch killed in the prologue scene beyond the Wall. Lord Yohn Royce, also known as "Bronze Yohn," is the chief agent of this house throughout the remainder of the series. However, neither of these characters ever touched Lamentation, as it was lost over a century before their births.

During the Dance of the Dragons, Ser Willam Royce held Lamentation, but the blade was lost following his death in King's Landing during a riot. Rumors suggest that Lamentation was last seen during the Storming of the Dragonpit, but the sword's fate was entirely unclear. It's doubtful we'll see Lamentation in The Winds of Winter, and there are no clues on where it might be. With roughly 170 years before its last known spotting, it could be anywhere in Martin's vast world, but the most compelling idea would be that it's still somewhere in the capital, possibly in the Dragonpit.

5 Orphan-Maker

Last Held By Unwin Peake

"Orphan-Maker" was another sword known for its uses during the Dance of the Dragons. It was originally held by House Roxton of the Reach and used by Jon Roxton of the Green faction at the Battle on the Honeywine and the Battles the Tumbleton. If House of the Dragon introduces Roxton and the sword, it should have a specific relevance pertaining to one of the show's main characters.

The sword was obtained by Lord Unwin Peake, the Hand of the King to King Aegon III Targaryen, following the Dance's conclusion. Given that we don't know the sword's fate after Lord Unwin, it's possible that House Peake of the Reach still holds on to it. This is another that seems unlikely to appear in The Winds of Winter, as it doesn't have any significant narrative relevance.

4 Brightroar

Last Held By Tommen II Lannister

"Brightroar" was the Valyrian steel sword of House Lannister, long before the events of A Song of Ice & Fire. The greatsword was owned by the Kings of the Rock when the Lannisters ruled the Westerlands as monarchs prior to Aegon's Conquest. King Tommen II Lannister sailed from Casterly Rock to the ruins of Old Valyria just after the Doom, hoping to obtain wealth and power from the remains of the great empire. Instead, he and the sword were lost there forever. Brightroar doesn't seem likely to appear in the books unless Euron Greyjoy stumbled upon it in Valyria.

The Lannisters paid an exorbitant amount of gold to purchase the sword from the Valyrian Freehold.

3 Vigilance

Last Held By Ormund Hightower

"Vigilance" was the sword of House Hightower and was another blade lost in the aftermath of the Dance of the Dragons. The sword was wielded by Lord Ormund Hightower, who was recently cast for House of the Dragon season 3. Following Lord Ormund's fate in the civil war, Vigilance was never found. This is yet another blade that likely won't have any relevance to A Song of Ice & Fire. It could be back in Oldtown with the Hightowers, meaning Samwell Tarly could end up spotting it, but that doesn't seem likely.

2 Truth

Last Held By Moredo Rogare

"Truth" is a Valyrian steel sword we know very little about, with the only information being brief mentions in The World of Ice & Fire and Fire & Blood. Truth was owned by Moredo Rogare, a Lysene nobleman, but its last known mention was nearly two centuries before the events of the novels. This sword is likely the least relevant to the main story and might even be one of the previously mentioned swords reforged.

1 Blackfyre

Last Held By Aegor Rivers

"Blackfyre" is possibly the Valyrian steel sword that has had the most influence on the history of Westeros. This was the sword that Aegon the Conqueror invaded Westeros with and was then owned by most of the Targaryen kings, including Aegon II, though he isn't shown having it in House of the Dragon. Eventually, Aegon IV gave the sword to his bastard, Daemon, who eventually established the cadet house, also named Blackfyre. Aegor Rivers, known as "Bittersteel," eventually took the sword to Essos, where he founded the Golden Company.

Blackfyre is one of the swords that could easily appear in The Winds of Winter, as the Golden Company is currently under the command of Aegon Targaryen, also known as "Young Griff." Aegon is a character left out of the Game of Thrones TV adaptation, but A Dance with Dragons saw him beginning to take control of the Stormlands with the help of the mercenary company. It's often believed that Aegon will retrieve Blackfyre from Illyrio Mopatis or from the Golden Company, solidifying his ers' belief in his claim to the Iron Throne.