The Rogue Prince, or, A King's Brother (by Archmaester Gyldayn)
The Rogue Prince, or, A King's Brother: A Consideration of the Early Life, Adventures, Misdeeds, and Marriages of Prince Daemon Targaryen is a history set at the end of the reign of Jaehaerys I Targaryen through the reign of Viserys I Targaryen. Concerning the life of Prince Daemon Targaryen, it was written by Archmaester Gyldayn of the Citadel of Oldtown. It uses the writings of Mushroom, Septon Eustace, Lord Otto Hightower, Grand Maester Runciter, Grand Maester Mellos, and Prince Daemon himself as sources.
He was the grandson of a king, the brother of a king, husband to a queen. Two of his sons and three of his grandsons would sit the Iron Throne, but the only crown that Daemon Targaryen ever wore was the crown of the Stepstones, a meager realm he made himself with blood and steel and dragonfire, and soon abandoned.