Gianna Martell was the sister of Prince Aryyn Martell and wife of King Harys Baratheon. She died giving birth to their own son, Rickon.
Quotes
"My aunt was a strong and passionate woman. My father still grieves her passing as if she left us yesterday." - Sarella Martell
"I'm sure you haven't forgotten Gianna? Would you want to see a lady of Tyrell acting as the mother for a Prince of Dorne?" - Gylen Hightower
"My aunt was once the queen: Gianna Martell, Harris Baratheon’s bride. She was a beautiful woman, and strong." - Sarella Martell