A Jedi From Earth Wikia

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Ser Kevan Lannister was the younger brother of Lord Tywin Lannister and one of his most loyal and trusted officers in the Lannister armies during the War of the Five Kings.

After his brother's death at the hands of his nephew Tyrion, Kevan opposes his niece Cersei's seizure of power as leader of her son King Tommen's Small Council. Refusing his appointment by Cersei as Master of War, he departs the court in protest and returns to Casterly Rock.

(Source GOT wiki)