Gerald

Gerald is a minor character in the second season. He is played by guest star Ken Fletcher and only appears in the third episode.

Season 2
He is a groom in the army of King Renly Baratheon. He was injured by a horse but recovered well. Renly greets him when he takes Catelyn Stark on a tour of his camp in the Stormlands.

In the books
In the Song of Ice and Fire novels, there is no equivalent character.