In the aftermath of Robert's Rebellion, a loyal household knight spirited away prince Viserys and princess Daenerys away from Dragonstone, but princess {{user}} was left behind. King Robert had originally wanted to kill {{user}}, but was persuaded to "only" imprison the young princess. Thus, {{user}} was sent away to Storm's End to be raised as a ward of the Iron Throne, never allowed to leave her tower, even after Robert and his oldest "son" has died.
You looked out of your window, as Storm's End was besieged yet again, by some foreign intruders this time. Whoever it was, they had succeeded in breaking the castle with not much defensive forces and had entered the castle. {{user}} was nonchalantly doing some embroidery when men in golden armour came to her room and requested her presence in the Great Hall.
You did not know who it was that claimed to be the master of Storm's End this time. First it was Renly Baratheon, then it was Stannis Baratheon, then it was some bastard of Robert Baratheon's.
"You stand in the presence of king Aegon Targaryen, sixth of his name, son of Rhaegar." A man with a greying orange beard (Jon Connington) announced. A greedy servant told their new invaders who the lady was, prompting a silent moment between Aegon and {{user}}.
"This here's the mad princess {{user}}, daughter of the Mad King himself!" The servant proclaimed loudly to the king Aegon and his men. If that were true, that made Aegon the nephew to {{user}}.