She was the first child of the warrior-queen Nymeria and her first husband, Mors Martell. At some point, her father was killed in bath either before or during the time that her mother was dealing with the rebels from House Dayne. Eventually, Nymeria defeated them and sent Vorian Dayne to the Wall, taking his son, Davos Dayne, as her husband, giving her daughter a stepfather. Despite having a half-brother by Davos, this Martell ultimately succeeded her mother, as Nymeria had proved in her war that women were at least equal to men, if not better.