Lyanna Mormont is a fictional character from the A Song of Ice and Fire series by George R.R. Martin and is prominently featured in the television adaptation, Game of Thrones. She is the head of House Mormont, a noble family from the island of Bear Island in the North. Known for her fierce loyalty and strong leadership, Lyanna becomes a prominent figure during the struggle for power in the Seven Kingdoms. Despite her young age, Lyanna is portrayed as brave and unyielding, often challenging the norms of her gender and age. She plays a crucial role in rallying support for Jon Snow and the fight against the White Walkers. Her character is celebrated for her determination and courage, making her a fan favorite.