HBO has started early development on a new Game of Thrones project, and it's set to be based on George R. R. Martin's prequel novellas series Tales of Dunk and Egg.

Variety reports that the one-hour show will follow the adventures of Ser Duncan the Tall, and a young Aegon V Targaryen. Set 90 years before the main A Song of Ice and Fire saga, from which GoT was adapted from, the show would likely include events from all three installments from the series, The Hedge Knight, The Sworn Sword, and The Mystery Knight. All three of the novellas have since been published together as A Knight of the Seven Kingdoms.