Being developed by "Kick-Ass" writer Jane Goldman, the story is set set during the Age of Heroes, thousands of years before the "Game of Thrones" saga.
"...yes, it is true, after more than a year of development, HBO has greenlit the first of the Game of Thrones successor shows that we've been working on, scripted by the amazing Jane Goldman," Martin wrote on his blog.
Martin, who often connects to fans through his blog 'Not a Blog', said they have an entire world and "tens of thousands of years of history" to explore in the prequels.
"As for the other successor shows if you have been following along, you know that we started with four, and eventually went to five. One of those has been shelved, I am given to understand, and of course Jane's pilot is now moving to film. But that does not mean the others are dead.
"Three more Game of Thrones prequels, set in different periods and featuring different characters and storylines, remain in active development. Everything I am told indicates that we could film at least one more pilot, and maybe more than one, in the years to come. We do have an entire world and tens of thousands of years of history to play with, after all. But this is television, so nothing is certain.
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