The 70-year-old has made millions from his best-selling fantasy series and the HBO TV show.
But how did Martin come up with A Game of Thrones almost 30 years ago?
Well, now the author has revealed how the first chapter came “out of nowhere” way back in 1991.
Speaking with The Guardian, Martin said: “When I began, I didn’t know what the hell I had.”
He continued: “I thought it might be a short story; it was just this chapter, where they find these direwolf pups.
“Then I started exploring these families and the world started coming alive.
“It was all there in my head, I couldn’t not write it.
“So it wasn’t an entirely rational decision, but writers aren’t entirely rational creatures.”
It turns out Martin has always wanted to give the genre a try after growing up on The Lord of the Rings.
He added: “Tolkien had an enormous influence on me, but after Tolkien there was a dark period in the history of epic fantasy where there were a lot of Tolkien imitations coming out that were terrible.
“I didn’t necessarily want to be associated with those books, which just seemed to me to be imitating the worst things of Tolkien and not capturing any of the great things.”
He added: “ “I’ve been struggling with it for a few years.
“The Winds of Winter is not so much a novel as a dozen novels, each with a different protagonist, each having a different cast of supporting players and antagonists and allies and lovers around them, and all of these weaving together in an extremely complex fashion.
“So it’s very, very challenging. Fire and Blood, by contrast, was very simple.
“Not that it’s easy, it still took me years to put together, but it is easier.”