Prince Jacaerys Velaryon, nicknamed Jace, is the eldest son of Rhaenyra Targaryen and her husband Laenor Velaryon, and his younger brothers are Lucerys and Joffrey Velaryon. He is second in line to inherit the Iron Throne after his mother.

Although presented as legitimate, Jacaerys and his brothers are in truth bastards fathered by Ser Harwin Strong. He is the rider of the dragon Vermax.