Willem Lannister is a member of House Lannister. He is the son of Ser Kevan Lannister and Dorna Swyft, and the twin brother of Martyn Lannister. He is a squire.
History[]
Lord Gawen Westerling, once suggested to Lord Tywin Lannister that Willem or his brother Martyn marry his daughter, Jeyne. Ser Kevan rejected the proposal due to Jeyne's dubious lineage on her mother's side.
Books[]
A Game of Thrones[]
Willem is part of the army commanded by his cousin, Ser Jaime Lannister, that lays siege to Riverrun. He fights in the Battle of the Whispering Wood, where he is captured by the forces of Robb Stark, along with his cousin Jaime, as well as another cousin, Tion Frey.
A Clash of Kings[]
Tyrion Lannister and Robb Stark attempt to negotiate Willem's release, but no agreement is reached. He shares a room with Tion, and is held captive in Riverrun.
A Storm of Swords[]
After the release of Jaime Lannister by Catelyn Stark, Lord Rickard Karstark, who had lost two of his sons in the Battle of the Whispering Wood, felt robbed of revenge, and chose instead to kill Willem and Tion. He kills one of the boys in their sleep, whilst the other dies fighting.
Robb Stark is furiious, and has Rickard and his accomplices executed.