Jon Lynderly

The Knight of House Lynderly is a minor character in Game of Thrones. He was originally played by guest star Patrick Rocks and appears in "A Golden Crown."

Season 1
The Knight is present when Tyrion Lannister demands a trial by combat for the charges of murdering Jon Arryn and conspiring to murder Bran Stark. He's the first to offer himself as the champion for Lady Lysa Arryn, followed by Eon Hunter and other men. However, Lady Lysa chooses Ser Vardis Egen as her champion.

In the books
In the Song of Ice and Fire novels, a member of House Lynderly of Snakewood is the first to offer himself as Lysa Tully's champion. Tyrion however doesn't recognize the Lynderly's identity. Later books identify at two other members of House Lynderly: Lord Jon Lynderly and his son, Terrance, a young squire.