Lyanna Mormont is the Lady of House Mormont of Bear Island a vassal House of the Starks of Winterfell. She is the cousin of the disgraced former Lord Jorah Mormont and the niece of Joer Mormont who was the Lord Commander of the Nights Watch. Despite her youth she is a strong willed and capable leader of her small but proud House. She was a strong supporter of Rob Stark and later his brother (Jon Snow). Her mother died leading their army against the Lannisters of Casterly Rock.