Nareys Targaryen is the fourth child of King Viserys and Queen Consort Alicent Targaryen but her mother never acknowledged her so her older sister Rhaenyra Targaryen takes pity on her and raises her as her own. In 121 A.C Alicent made Nareys and Jacaerys marry and that was what happened. They were both 16 and when Viserys died Alicent sent Nareys into Maegors hold fast and her children. Nareys looses her only son in the midst of the war and flees Kingslanding with her dead son and only daughter to Dragonstone to which she swears loyalty to her sister and husband.