Yara Greyjoy

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Queen Yara Greyjoy is an Ironborn, Theon Greyjoy's older sister and his only surviving sibling. She was raised at Pyke, the stronghold of House Greyjoy. Yara is a fierce warrior and commands her own longship. She is currently a claimant to the throne of the Kingdom of the Iron Islands and an ally of Daenerys Targaryen, despite being captured and taken prisoner by her uncle, Euron Greyjoy, during the assault on the Targaryen Fleet.
Yara is captain of her own longship, the Black Wind.

In the A Song of Ice and Fire novels Yara is called Asha Greyjoy, but her name was changed in the TV series; possibly to prevent confusion with Osha the wildling. Ironically, as the daughter of a Great House and one of Balon Greyjoy's only two surviving children, Asha Greyjoy is actually a much more prominent character than Osha the wildling; Asha is even a POV character in several chapters. Thus it is curious why they changed Asha's name and not the other way around. It is probably because Osha was already introduced in Season 1 and the similarity with Asha Greyjoy's name wasn't realized until production on Season 2 began.