Martyn Lannister is a young squire in the Lannister army in HBO's Game of Thrones, a son of Kevan Lannister and a younger brother of Willem and Ser Lancel Lannister.
In Season 3 he and Willem are captured by House Tully after the Battle of the Fords and held hostage at Riverrun, where Talisa tends his wounded hand. Judged too minor to trade for the Stark girls, the brothers are murdered in their cells by Rickard Karstark in revenge for Jaime Lannister's killing of Karstark's son Torrhen. He is portrayed by Dean-Charles Chapman, later cast as Tommen Baratheon. Chronology is tracked in the Timeline.
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