Add Category
Martin's fictional history, Fire & Blood, the first of two planned volumes, will cover all the Targaryen kings from Aegon I to Aegon III, along with their wives, siblings, wars and travels, he said.
Game of Thrones, the TV series, will return in 2019... whether George Martin's next book will be ready by then remains a mystery.
"Oh, and there are dragons too. Lots of dragons," he added.
Martin said he was now turning his attention back to Winds of Winter but did not say when he hoped to finish it.
The television series, which returns for a final season in 2019, has already moved beyond the events of Martin's five published books.
Time Warner Inc's HBO network has said it is working on three to five possible Games of Thrones spinoffs but Martin was coy on whether material from Fire & Blood would be used.
The HBO series has moved beyond the books but fans are still eager for Martin's next installment.
"I know I am going to be asked whether those shows are going to be based on material from FIRE & BLOOD. It's a logical question. The only answer I can give is ... ah, well, no one is sure yet, and anyway, I am not allowed to say," he wrote.
Reuters