Lord Harald Karstark is the head of House Karstark and a bannerman of House Bolton, appearing in the sixth season of the HBO series Game of Thrones. The youngest son of Lord Rickard Karstark, he became lord of Karhold after the deaths of his father and brothers, Harrion and Torrhen, during the War of the Five Kings.
Harboring a bitter hatred of House Stark after Robb Stark executed his father, Harald declared his house for the Boltons. He counsels Roose and Ramsay Bolton at Winterfell and rides with Ramsay's forces at the Battle of the Bastards, where he leads the cavalry charge and is killed. He was succeeded at Karhold by his daughter, Alys Karstark.
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