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Rickard Karstark is the Lord of Karhold, which is northeast of the Dreadfort. His Banner is a (rising (?)) Sun on white Background.

He is a vassal of King Robb Stark of The North. His relatives are (among others):

Harrion Karstark (son) King Robb Stark (relative)

In the Books he is one of the mightiest Bannermen of the Starks, together with Roose Bolton.