Theon Greyjoy

Prince Theon Greyjoy is a major character in the A Song of Ice and Fire and it's TV adaptation Game of Thrones. He was the heir to the Iron Islands before his father, Balon Greyjoy but this was forfeited in the novels when his uncle became king

After his father's failed rebellion against Robert Baratheon, which led to Balon bending the knee and his two brothers being murdered, Theon was taken as a ward/hostage for Eddard Stark. Despite the circumstances, Theon became a close friend and surrogate brother of Robb Stark. However, a part of him was always insecure about what his true heritage was and would always be forced to make a choice: Stark or Greyjoy.

During the War of the Five Kings, Theon pledged fealty to Robb Stark and decreed him King of the North. To get him a navy, Theon returned to Pyke after ten years to negotiate with his father. However, Theon sided with his family out of insecurity about his heritage and betrayed the Starks by sacking Winterfell and murdering some of its inhabitants (such as Mikken the blacksmith and Ser Rodrik Cassel in the TV series). He also murdered and burnt two farmer's sons and claimed they were Rickon and Bran so there would be no opposition to his claim of Winterfell.

However, Theon was betrayed by his advisor, Reek (who was actually Ramsay Bolton) who murdered everyone and put Winterfell to the torch. Kidnapped and tortured in the Dreadfort for a year, Theon was broken into Ramsay's half-insane plaything/servant, Reek. He helped clear the Ironborn from Winterfell and assisted in the marriage of Arya Stark (in reality Jeyne Poole one of Sansa's friends from Winterfell). Eventually, Reek broke from this identity and regained his identity as Theon by helping Jeyne escape the sadistic Bastard of Bolton's abuse.

Whislt escaping from Ramsay Theon encounters his sister, Yara who was captured by Stannis Baratheon and plans to burn him to stop the winter and continue his march onto Winterfell and also avenge the murdered "Stark Boys".

He was portrayed by Alfie Allen in the TV series.