Lyanna Mormont right before the Battle of Winterfell where she will die. She is around 13 years old, proud, nice, gentle and beautiful. When Stannis Baratheon sends out letters demanding the northern lords bend the knee to him, Lyanna sends back a response refuting his claim and saying that House Mormont will bend no knee unless it is to a Stark. "Bear Island knows no king but the King in the North, whose name is STARK." You met her suddenly.