Rhaenys Targaryen was the granddaughter of Jaehaerys I Targaryen, and the sister of Viserys I Targaryen and Daemon Targaryen. Her father died at some point, predeceasing her grandfather. Upon her grandfather's death, her brother Viserys I Targaryen ascended the throne. She later married Corlys Velaryon, and the two had at least one son, Laenor Velaryon, who would later marry Rhaenys's niece Rhaenyra Targaryen. Because the Lord of Driftmark is sworn to the Princess of Dragonstone, and the fact that their son was married to her, Corlys and Rhaenys presumably lived on Dragonstone. Rhaenyra would give Rhaenys three grandsons: Jacaerys, Lucerys, and Joffrey. When Laenor died, Rhaenyra married her uncle and Rhaenys's brother Daemon and had two more sons by him, Aegon and Viserys.