Karhold

Karhold, formerly known as Karl's Hold, is a castle in the North and the seat of House Karstark, a vassal house holding fealty to House Stark of Winterfell. It is located in the far east of the North, south of the Bay of Seals and inland from the coast of the Shivering Sea. Further to the east are the Grey Cliffs.

History
The castle was founded by Karlon Stark, a younger son of the then-King in the North after he was rewarded with lands by his father for putting down a rebellion by House Bolton of the Dreadfort. The castle was then called "Karl's Hold". Over the centuries Karl's Hold became Karhold, and the Karl's Hold Starks became House Karstark.

Season 1
A raven is sent from Winterfell to Karhold when Robb Stark calls his banners after receiving word from King's Landing about Ned Stark's imprisonment. Lord Rickard Karstark readies his forces and marches them south. A small garrison is left behind under the command of Lord Rickards brother Arnolf.

Season 3
After Robb Stark executes Lord Rickard, the Karstark forces march home. Lord Rickards son Harrion is now Lord of Karhold.

Season 5
House Karstark has bent the knee to House Bolton. Ramsay Bolton decides to take Alys Karstark to Winterfell as a ward, using her to keep the Karstark's loyal.