The four possible, different shows will all be set within the same fictional, fantasy world of Westeros and revolving around different groups of characters. In a statement HBO said the possible spin-off series will "explore different time periods of George R.R. Martin's vast and rich universe".
Last year George R.R. Martin told Entertainment Weekly in an interview that "there are 8 million stories in Westeros and even more in Essos and the lands beyond. A whole world full of stories, waiting to be told".
Writers Max Borenstein, Jane Goldman, Brian Helgeland and Carly Wray with George R.R. Martin assisting. The writers are not under pressure to turn in scripts since HBO wants to give them time to deliver four different and compelling takes on how to explore more of the Game of Thrones world.
"We'll take as much or as little time as the writers need and, as with all our development, we will evaluate what we have when the scripts are in," said HBO.
The 7th season of Game of Thrones, with the series nearing its conclusion and broadcast in South Africa and Africa on M-Net (DStv 101), will start on 16 July.
The final 13 episodes of the drama series that won the Emmy award for best drama the past two years, will conclude in 2018.