Ros

Ros is a recurring character in Game of Thrones. She is played by guest star Esme Bianco and débuts in the first episode of the first season. Ros is a prostitute and renowned beauty.

Background
Ros is a prostitute in a brothel in Winterfell's outlying town. She has drawn the attention of the young nobles of Winterfell including Theon Greyjoy and Jon Snow. Theon is a regular customer while Jon is not.

Season 1
Ros is shown entertaining Tyrion Lannister shortly after his arrival at Winterfell. She informs Tyrion that the whorehouse was especially alerted to his imminent arrival, though by whom is not revealed. Theon Greyjoy recommends Ros to Tyrion, unaware that Tyrion is already acquainted with her. Tyrion promises 'not to wear her out'. Jon Snow mentions to his friend that Ros once tried to seduce him but he refused. Theon sneaks Ros into his chambers. He becomes angry when she insinuates that Tyrion is a superior lover and that his family's honor is suspect due to the failed Greyjoy Rebellion. When he refuses to pay for the encounter, Ros suggests that he gets a wife instead, infuriating Theon further. Theon is surprised to see Ros sitting in the back of a turnip carriage. She tells him she has decided to leave Winterfell to seek out employment in King's Landing, and is planning to get a ship from White Harbor. Theon reluctantly says he'll miss her.

Arriving in King's Landing, Ros finds employment at a brothel owned by Littlefinger. He tutors her and another prostitute, Armeca, in the art of seduction. Ros learns that Littlefinger is infatuated with a woman who was betrothed to a man who injured him in a duel, but she later married the man's brother. However, it does not appear that she recognises the woman in the story as Lady Catelyn Stark.

Ros's services are employed by Grand Maester Pycelle in King's Landing. As she gathers her clothes to leave, Pycelle begins to tell her about all the kings he has served, eventually his ramblings fade and she becomes impatient, questioning him about the original point of his speech. She leaves, frustrated.

In the books
Ros does not appear in the books and is the first character created specifically for the show. However, some fans have speculated that her role is based on the 'red-headed whore' who appears very briefly in the first novel. This is strengthened by the fact that Bianco was originally announced as playing 'red-headed whore' and that the character was given a name at George R.R. Martin's suggestion.