Willem Lannister is a young member of House Lannister in Game of Thrones, a younger son of Kevan Lannister and a younger brother of Lancel and Martyn Lannister. During the War of the Five Kings he serves as a squire in the Lannister host.
Captured alongside his brother Martyn at the Battle of the Fords, he is held hostage at Riverrun by House Tully. The two boys are murdered in their cells by Rickard Karstark and his men in retribution for the deaths of Karstark's sons, an act that has grave consequences for Robb Stark's cause. This Overview summarizes his role under CC BY-SA; his chronology is detailed in the Timeline.
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