Tales of Dunk and Egg is a series of fantasy novellas by George R. R. Martin, set in the world of his A Song of Ice and Fire novels. They follow the adventures of "Dunk" and "Egg", some 90 years before the events of the novels. From Wikipedia
The Game of Thrones prequel, based on George R.R. Martin's Dunk & Egg novellas, shifts its release date as part of HBO's scheduling strategy.
