Prince Daemon is the second son of the late Prince Baelon Targaryen and his wife (and sister), Alyssa. Daemon's older brother is Viserys I, the King. A dragonrider like his brother, his dragon is Caraxes. Daemon marries three times throughout his life. His first wife, Rhea Royce, dies young in a horse-riding accident. He remarries to Laena Velaryon, who has Targaryen blood through her mother, Princess Rhaenys Targaryen; they have two daughters, Baela and Rhaena.
After Laena's death in childbirth, Daemon marries for the third and final time to his niece, Princess Rhaenyra Targaryen. They have two sons and a daughter, and Daemon becomes one of Rhaenyra's biggest champions in her quest to claim the Iron Throne she believes is rightfully hers and her descendants'.