Talking Game of Thrones: Lyanna Stark
Lyanna Stark is the sister of Ned Stark of Winterfell, the former betrothed of Robert Baratheon and the mother of Jon Snow. The father is of course Rhaegar Targaryen. Rhaegar's abduction of Lyanna was the spark to Robert's Rebellion which would lead to the devastation of the Targaryen House and the exile of Daenerys Stormborn who is Rhaegars sister and Jon Snow's aunt.