Born around 230, Princess Rhaelle Targaryen was the youngest daughter of Aegon V Targaryen and his wife Betha Nerbosc. She was the niece of Maester Aemon (whom she called "Uncle Maester").
She was married to Ormund Baratheon, heir of House Baratheon, and had at least one son, Steffon. She is therefore the grandmother of Robert, Stannis and Renly Baratheon.