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who wrote season 7 of game of thrones
Game of Thrones used seven writers in six seasons. Series creators David Benioff and D. B. Weiss, the showrunners, write most of the episodes each season.
is the storyline of season 7 of game of thrones from the a song of fire and ice series
Season 7 of Game of Thrones largely consisted of original content not found in Martin's A Song of Ice and Fire series.
where did the storyline of season 7 of game of thrones come from
Season 7 of Game of Thrones consists of original content but also adapts material from George R. R. Martin's upcoming novels The Winds of Winter and A Dream of Spring

Question: when did the author begin wrting the series
Self-contained rewrite: when did george r. r. martin begin writing the a song of fire and ice series