Jeyne Poole

Jeyne Poole, also known as Arya Stark, is the wife of Ramsay Bolton and Lady of Winterfell.

Background
Jeyne was born in 286 AC to Vayon Poole and his wife Corinne. She grew up in Winterfell and was a close friend of Sansa Stark, accompanying her to King's Landing. However, when the tensions between Houses Stark and Lannister turn violent, Vayon is killed in the conflict while Jeyne is captured.

A Dance with Dragons
Eventually, the Lannisters hand Jeyne over to Roose Bolton, the new Warden of the North, and pass her off as Arya Stark. In order to enhance his family's claim to the North, Roose marries "Arya" to his son Ramsay, who viciously abuses Jeyne. Jeyne, desperate to get away from her husband, flees Winterfell with Theon Greyjoy. Upon escaping, Jeyne and Theon are discovered by Stannis Baratheon's forces. Stannis has Theon arrested alongside his sister, and has Justin Massey send Jeyne to Jon Snow at the Wall.