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American novelist and short-story writer, screenwriter, and television producer George R. R. Martin attends a press conference on August 16, 2017 in Saint Petersburg, Russia. (Photo by Igor Russak/NurPhoto via Getty Images)

American novelist and short-story writer, screenwriter, and television producer George R. R. Martin attends a press conference  on August 16, 2017 in Saint Petersburg, Russia. (Photo by Igor Russak/NurPhoto via Getty Images)

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WEST HOLLYWOOD, CA - SEPTEMBER 17: (EXCLUSIVE COVERAGE) Actress Emilia Clarke (L) and writer George R. R. Martin attend the BBC America BAFTA Los Angeles TV Tea Party 2016 at The London Hotel on September 17, 2016 in West Hollywood, California. (Photo by Kevork Djansezian/BAFTA LA/Getty Images for BAFTA LA)

WEST HOLLYWOOD, CA - SEPTEMBER 17:  (EXCLUSIVE COVERAGE)  Actress Emilia Clarke (L) and writer George R. R. Martin attend the BBC America BAFTA Los Angeles TV Tea Party 2016 at The London Hotel on September 17, 2016 in West Hollywood, California.  (Photo by Kevork Djansezian/BAFTA LA/Getty Images for BAFTA LA)

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WEST HOLLYWOOD, CA - SEPTEMBER 17: (EXCLUSIVE COVERAGE) Actress Maisie Williams and author George R.R. Martin attend the BBC America BAFTA Los Angeles TV Tea Party 2016 at The London Hotel on September 17, 2016 in West Hollywood, California. (Photo by Frazer Harrison/BAFTA LA/Getty Images for BAFTA LA)

WEST HOLLYWOOD, CA - SEPTEMBER 17:  (EXCLUSIVE COVERAGE)  Actress Maisie Williams and author George R.R. Martin attend the BBC America BAFTA Los Angeles TV Tea Party 2016 at The London Hotel on September 17, 2016 in West Hollywood, California.  (Photo by Frazer Harrison/BAFTA LA/Getty Images for BAFTA LA)

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ST PETERSBURG, RUSSIA - AUGUST 17, 2017: George R.R. Martin, an American novelist, author of a series of fantasy novels, A Song of Ice and Fire, adapted into TV series Game of Thrones, signing autographs at a Bukvoyed bookshop. Alexander Demianchuk/TASS (Photo by Alexander Demianchuk\TASS via Getty Images)

ST PETERSBURG, RUSSIA - AUGUST 17, 2017: George R.R. Martin, an American novelist, author of a series of fantasy novels, A Song of Ice and Fire, adapted into TV series Game of Thrones, signing autographs at a Bukvoyed bookshop. Alexander Demianchuk/TASS (Photo by Alexander Demianchuk\TASS via Getty Images)

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HOLLYWOOD, CA - MARCH 19: Actors Michelle Fairley, Maisie Williams, Sophie Turner, Kit Harington, executive producer George R.R. Martin, actors Nikolaj Coster-Waldau, Peter Dinklage, Lena Headey, co-creator/executive producer David Banioff and co-creator/executive producer D.B. Weiss attend The Academy of Television Arts & Sciences' Presents An Evening With "Game of Thrones" at TCL Chinese Theatre on March 19, 2013 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images)

HOLLYWOOD, CA - MARCH 19:  Actors Michelle Fairley, Maisie Williams, Sophie Turner, Kit Harington, executive producer George R.R. Martin, actors Nikolaj Coster-Waldau, Peter Dinklage, Lena Headey, co-creator/executive producer David Banioff and co-creator/executive producer D.B. Weiss attend The Academy of Television Arts & Sciences'  Presents An Evening With "Game of Thrones" at TCL Chinese Theatre on March 19, 2013 in Hollywood, California.  (Photo by Alberto E. Rodriguez/Getty Images)