Martin has yet to reveal the truth on the page, but on Tuesday night’s episode of The Writers’ Room screenwriters David Benioff and D.B. Weiss admitted he had confessed it to them.
The pair described having a five-hour meeting with Martin to pitch their idea to adapt the books as a TV series, rather than feature films.
“At the very end of it he said ‘So who is Jon Snow’s real mother?’ – it was a test question,” Benioff told host, US screenwriter and actor Jim Rash.
“We had talked about it amongst ourselves before, and we had an educated guess, which turned out to be right, which is why we’re sitting here,” Weiss said.
“I’m sure he had met other people who had wanted to work on it, studios at least, who hadn’t really read the books, they’d read the cover,” Benioff said.
“I’d be floored if they’d cracked it,” Nash replied.
Martin, who is writing the sixth of the planned seven-book series, has yet to reveal the truth of Jon Snow’s origins on the page, although many fans believe certain facts in earlier novels point to one likely candidate.