Colen

A Baratheon Guard is an unnamed minor character in the second season. He is played by guest star Darren Killeen and only appears in the third episode.

Season 2
He announces Catelyn Stark when she arrives at King Renly Baratheon's camp.

In the books
In the Song of Ice and Fire novels, Catelyn is met by Ser Colen of Greenpools on her approach to Renly's camp and he escorts her the rest of the way there.