From A Wiki of Ice and Fire
|Location || Westeros, North|
|Government || House Karstark , Feudal Lord.|
|Religion || Old Gods|
|Named for || Karlon Stark its founder.|
Karhold is the seat of House Karstark in the North. It is a strong castle. It lies in the eastern half of the North, south of the Bay of Seals, further to the east lies the Grey Cliffs.
The castle was build by Karlon Stark, the founder of the Karstarks's and was named Karl's Hold after him. The name eventually developed into Karhold.
Maester Aemon sent a raven to Karhold in a plea for help to defend Castle Black from wildlings.
References and Notes