Ser Alton Lannister is a recurring character in the second season. He is played by guest star Karl Davies and debuts in "The North Remembers." Ser Alton Lannister is a young knight from a cadet branch of House Lannister and a captive of the Northern armies alongside his cousin, Ser Jaime Lannister. He is sent to deliver Robb Stark's peace terms to King's Landing, and he is killed by Jaime Lannister inside a prison cell at Robb Stark's camp.