HBO Orders 'Game of Thrones' Prequel Series 'A Knight of the Seven Kingdoms: The Hedge Knight' and 'Dunk and Egg'.

HBO has officially announced the development of a "Game of Thrones" prequel based on George R.R. Martin's "Dunk and Egg" books, titled "A Knight of the Seven Kingdoms: The Hedge Knight." The series will follow the adventures of Ser Duncan the Tall and a young Aegon V Targaryen 90 years prior to the events of "A Song of Ice and Fire." Martin will serve as writer and executive producer, with Ryan Condal and Vince Gerardis as executive producers. The series is the latest Westeros-based project at HBO, following the success of "Game of Thrones" and "House of the Dragon."