In case you’re wondering whether or not that excludes the prequel events of Robert’s Rebellion, Martin explicitly states that particular Game Of Thrones prequel will not be made.
Considering the longevity of Tolkien’s works, and how stories are still being spun off the originals to this day, branching outward appears to be a smart decision for Martin, as opposed to continuing the stories of the core cast of Game Of Thrones.
I’m still a little bummed, though, as any hopes of seeing the entirety of Robert’s Rebellion on the small screen are now slim to nil.
It sounds as though the author is more concerned with creating new and original stories that’ll continually expand his fantasy world, much like the Lord Of The Rings franchise has done with J.R.