Barra

Barra is a minor character in Game of Thrones. The young actor or actress playing her has not been identified. She only appears in the fifth episode of the first season. She is the bastard child of King Robert Baratheon and Mhaegen.

Background
Barra is an infant, the bastard child of King Robert Baratheon and Mhaegen. Mhaeghen is a prostitute working for Petyr Baelish in King's Landing. Barra lives with Mhaeghen in one of his brothels.

Season 1
Lord Baelish brings Eddard Stark to see Mhaegen at his brothel. She tells him that her daughter Barra is Robert Baratheon's child, one of his many bastards. Jaime Lannister and his men ambush Eddard whilst he is leaving the brothel where Barra lives.

Season 2
During a purge of the late King Robert's bastard children carried out by the Gold Cloaks, Barra is killed by Lord Janos Slynt before the eyes of her mother and several prostitutes, including Ros.

In the books
In the Song of Ice and Fire novels, Barra is identified as an infant with thin, dark hair who resembles her half-sister, Robert's bastard daughter Mya Stone (who has not appeared in the TV series so far), as a baby.