House Karstark

"We are kin. Stark and Karstark."

- Lord Rickard Karstark to King Robb Stark.

House Karstark of Karhold was a vassal house that held fealty to House Stark of Winterfell prior to the execution of Lord Rickard Karstark. Their lands are northeast of Winterfell, located in heavy forested lands overlooking the Shivering Sea. Their stronghold is a castle called Karhold and the head of the house is the Lord of Karhold.

Background
House Karstark is a cadet branch of House Stark and trace their descent from Karlon Stark, and through him, to the Starks and the First Men. Karlon Stark was a younger son of the King in the North who was awarded lands on the eastern region of the North after putting down a rebellion of House Bolton of the Dreadfort, about a thousand years ago. Over time, Karlon's seat, originally known as Karl's Hold, became known as Karhold, while the Karl's Hold Starks became known as Karstarks.

The Karstark sigil is a white sunburst on black. Their words are "The Sun of Winter."

Season 1
When Robb Stark calls his banners to march south to rescue Eddard Stark, House Karstark is among them. Harrion Karstark dies in a battle.

Season 2
After being captured by the Northern army at the Battle of the Whispering Wood, Ser Jaime Lannister escapes after killing his guard Torrhen Karstark. After arguing with Torrhen's father Lord Rickard Karstark, the Lord of Karhold, and fearing that Jaime will be executed after his recapture, Catelyn Stark releases him to Brienne of Tarth so that he can brought to King's Landing which only increases Lord Karstark's animosity towards Catelyn.

Season 3
As an act of revenge against House Lannister, Lord Rickard Karstark, the Lord of Karhold, breaks into the dungeons of Riverrun and murders Martyn and Willem Lannister, without the permission of Robb Stark, the King in the North. Robb executes Lord Karstark and the members of his household who assisted him under charges of treason. When Robb asks Karstark if he has any last words, he replies with "You are no king of mine" and is beheaded. Afterward, Lord Rickard's retainers abandon Robb's cause, greatly reducing the size of the Northern army.

Members

 * Lord {Rickard Karstark}, Lord of Karhold, executed by King Robb Stark under charges of treason for the murder of Martyn and Willem Lannister.
 * His son, {Harrion Karstark}. Died in battle fighting by the side of King Robb Stark during the War of the Five Kings.
 * His son, {Torrhen Karstark}. Killed by Ser Jaime Lannister during an escape attempt.

In the books
In the A Song of Ice and Fire novels, House Karstark's origins remain the same. The Karstarks are reliable and fierce warriors. They have ties to House Hornwood through the female line. Their military power is formidable, as they are able to field some 300 cavalry and 2,000 infantry. They fought alongside the Starks during Robert's Rebellion.

Lord Rickard has three sons in the books: Harrion, Torrhen, and Eddard, as well as a daughter Alys. Harrion takes part in the Battle of the Green Fork and taken as a hostage (it is unknown if he is still alive), while it is his brothers Torrhen and Eddard are killed by Jaime Lannister during the Battle of the Whispering Wood. Eddard and Torrhen serve as part of Robb Stark's personal bodyguard. When Jaime realizes that his army is lost during the Battle of the Whispering Wood, he makes a final push to single-handedly carve his way through the Northern army in an attempt to kill Robb Stark in single combat. Jaime manages to reach Robb's personal bodyguard and kill several of them, including Eddard and Torrhen, before being knocked unconscious.

Members in the books:
 * {Rickard Karstark}, executed by Robb Stark for treason
 * His eldest son and heir, Harrion, taken hostage by House Lannister. His fate is unknown.
 * His second son, {Torrhen}, killed by Jaime Lannister in the Battle of the Whispering Wood.
 * His third son, {Eddard}, also killed by Jaime Lannister in the Battle of the Whispering Wood
 * His daughter, Alys.
 * His uncle, Arnolf, castellan of Karhold. Pretends to be Stannis's ally but collaborates with the Boltons.
 * Cregan, Arnolf's eldest son
 * Arthor, Arnolf's second son
 * Three grandchildren, sons of Arthor

Because the Karstarks' forces withdrew from the war after King Robb executed Lord Rickard, they are the only major House from the North (besides House Bolton) whose military strength remains relatively intact after the Red Wedding, because their forces were not physically present for the massacre. The Karstark cavalry had been with Robb's field army in the west at Riverrun, and immediately rode back north for Karhold. The Karstark infantry, meanwhile, was in the eastern field army under the command of Roose Bolton. Robb divided his armies by sending the cavalry west and the infantry east. By this point Bolton had decided to betray Robb and seize control of the North, so he intentionally sent the Northern infantry on suicide missions such as the disastrous Battle of Duskendale and Battle of Ruby Ford, in order to bleed the strength of other Northern Houses still loyal to the Starks. Roose ultimately betrayed two thirds of the infantry under his command to their deaths, about 5,000 men. Roose always made sure to send infantry of staunch Stark-loyalists into these ambushes, while holding back and preserving the soldiers of House Bolton. The result was that when Roose reached the Twins for the Red Wedding he had 3,500 men under his command, a mix of his own Bolton forces and Karstark men - Bolton had spared the Karstarks because he judged that their loyalty to the Starks was wavering by this point. Though not entirely clear, the surviving Karstark infantry were apparently not harmed during the massacre at the Red Wedding, though it is clear that none outright joined the Boltons and Freys in attacking the other Stark soldiers. Thus the Karstarks are the only Northern family other than the Boltons to retain their military strength - besides the Northern hill tribes and the crannogmen, whom Robb left behind in the North because they aren't well-armed or used to pitched battles, and would be better suited to harassing any Lannister armies that attempt to invade the North. Even so, due to their continued anger over the execution of Lord Rickard, even after the atrocity of the Red Wedding, the Karstarks become one of the Northern Houses that is more ready to accept the new rule of House Bolton.

It is unclear exactly how much of the Karstark armies survived after the Red Wedding. When Robb initially marched to the south, they had 300 cavalry and two thousand infantry. Most if not all of the cavalry survived, and cavalry are worth more than basic infantry levies. Bolton is later said to have an army numbering about 3,000 after the Red Wedding, however, which would imply that only about 500 Karstark infantry survived his intentionally suicidal campaigns in the east - though in all probability, many of the Karstark infantry as well as cavalry may have simply ridden back to the North well before the Red Wedding after Lord Rickard was executed: this would mean that that 500 or so Karstark footsoldiers still in Bolton's eastern army simply hadn't had the opportunity to march back north yet.

Following the battle of Castle Black, Stannis sends letters to all the Northern lords asking for their support, but only Arnolf Karstark - who is not a lord but a castellan - answers the summoning. However, he is actually in league with the Boltons, and encourages Stannis to fight them while intending to switch sides at the critical moment and destroy Stannis's host, as Roose reveals to Ramsay. Arnolf declares publicly that he supports Stannis for another purpose: he hopes that the Lannisters execute Rickard's surviving son Harrion (whose whereabouts and status are unknown) as a payback for Arnolf's "support" of their enemy, and by that - Rickard's daughter Alys will become the heiress of Karhold. Arnolf plans to force her to marry his son Cregan, and after she gives birth to his son - they will gain legal ownership of Karhold, and dispose of Alys. Alys learns about her great-uncle's twofold treachery, escapes from Karhold and comes to Castle Black, where she informs Jon Snow about the scheme. Jon sends Tycho Nestoris to find Stannis and warn him of the traitor in his host. Since in the novels the battle of Winterfell has not begun yet, this turn of events may foil Roose Bolton's plan to destroy Stannis.