From A Wiki of Ice and Fire
|Title||Lord of Karhold|
|Book(s)|| A Game of Thrones (Appears)|
A Clash of Kings (Appears)
A Storm of Swords (Mentioned)
A Dance with Dragons (Mentioned)
A Game of Thrones
Harrion accompanies his father and his two brothers Torrhen and Eddard to Winterfell when Robb Stark calls his banners. When the northern host reaches the Twins and splits, Harrion is placed under the command of Lord Roose Bolton and marches down the Kingsroad to the Fords. He is captured during the Battle of the Green Fork by a hedge knight.
A Clash of Kings
Tyrion Lannister offers to trade Harrion along with Ser Wylis Manderly for Willem Lannister in an exchange of prisoners. During his stay at Harrenhal, where Harrion is being kept while waiting for a prisoner transfer, he walks the battlements alone.
A Storm of Swords
After Roose Bolton takes Harrenhal, Harrion is among the Northern prisoner released. Roose sends him along with with Robett Glover, Ser Helman Tallhart and other northerners to take Duskendale. His whereabouts after the Battle of Duskendale are unknown. Harrion becomes Lord of Karhold when Robb has his father Rickard executed for treason after he kills Willem Lannister and Tion Frey.
A Feast for Crows
A Dance with Dragons
Arnolf Karstark declares for Stannis Baratheon, hoping that when the Iron Throne learns of this they will execute Harrion, thus making his sister Alys the heir to Karhold. Arnolf's plan is to wed his son Cregan to Alys and claim Karhold. Arnolf's declaration for Stannis is also a plot orchestrated alongside Roose Bolton; the plan is to turn against Stannis once his forces reach Winterfell.
Arnolf's plot to claim Karhold is ruined when Jon Snow arranges a marriage between Alys and Sigorn, the Magnar of Thenn, and sends a raven to King Stannis informing of Arnolf's treachery. Should Harrion die, lordship of Karhold would pass to the newly-styled House Thenn.
|Cregan Karstark||Arthor Karstark|