Karhold

Karhold is the stronghold 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.

In the books
In the Song of Ice and Fire novels, the castle was founded by Karlon Stark, a younger son of the then-King in the North. The castle was then called 'Karlon's Hold'. He was rewarded by his father for putting down a rebellion by House Bolton of the Dreadfort. Over the centuries Karlon's Hold became Karhold, and the Karlon Hold Starks the Karstarks. They remain amonst the Stark's strongest and most loyal supporters.