A prequel series to George R.R. Martin's Game of Thrones is in early development at HBO Studios, according to Variety.

The show, which would be made of one hour episodes, will be based on a series of fantasy novellas by the 'A Song of Ice and Fire' author. The show is set to follow the adventures of Ser Duncan The Tall (Dunk) and a young Aegon V Targaryen (Egg), up to 90 years before the events of 'A Song of Ice And Fire.'

Martin's three novellas in the 'Tales of Dunk and Egg' have been published over the past 23 years. 'The Hedge Knight' came in 1998, 'The Sworn Sword' in 2003, and 'The Mystery Knight' in 2010. All three novellas were then published together as 'A Knight of the Seven Kingdoms' in 2015.

The series has been highly anticipated by fans, who have been calling for a 'Tales of Dunk and Egg' series for years.

It seems that they are now getting their wish as HBO attempts to capitalise on the success of Game of Thrones. The network is currently developing another Game of Thrones series called 'House of The Dragon', which is set to star Olivia Cooke, Matt Smith and Emma D'arcy. No writer or cast is currently attached to 'Tales of Dunk and Egg'.